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Replacement engine for 1993 SNCB?

Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=47956
Printed Date: April-27-2024 at 7:14pm


Topic: Replacement engine for 1993 SNCB?
Posted By: 93 Ski Nautique
Subject: Replacement engine for 1993 SNCB?
Date Posted: August-25-2019 at 12:04am
Well, it looks like the brackish water has taken it's toll on my engine. I have not pulled apart the engine yet but I anticipate repowering my 1993 Ski Nautique base boat (351 carbed, not GT40).   I have water filling up my cylinders on the left side.

A couple of years ago SKI DIM had a PCM Chevy conversion, complete engine which would seem to be convenient but no longer are available from them. Also, I have always had boats with Fords and I really like the low end torque, and sound of the Fords.

I cannot seem to find a complete engine for a 351 at all, I am finding long block remans, Michigan Marine, and others have these ready to go. Of course this means bringing over my tin and other 25 year old parts

So, I realize there is not "right answer", but for those of you with reverse rotation, carbed 351 engines, what are your recommendations for a repower?






Replies:
Posted By: Gary S
Date Posted: August-25-2019 at 1:26am
You sure you have a reverse rotation? What trans is in it?

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95 Nautique Super Sport


Posted By: 8122pbrainard
Date Posted: August-25-2019 at 8:11am
Originally posted by 93 Ski Nautique 93 Ski Nautique wrote:

Well, it looks like the brackish water has taken it's toll on my engine. I have not pulled apart the engine yet but I anticipate repowering my 1993 Ski Nautique I have water filling up my cylinders on the left side.

John,
Could the problem just be exhaust manifolds or maybe you just want a new engine? Boats run in full salt replace manifolds on a regular basis.

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54 Atom

/diaries/details.asp?ID=2179" rel="nofollow - 77 Tique

64 X55 Dunphy

Keep it original, Pete
<


Posted By: Orlando76
Date Posted: August-25-2019 at 8:45am
Originally posted by Gary S Gary S wrote:

You sure you have a reverse rotation? What trans is in it?
1993 is almost guaranteed to be LH. ‘94 they sort of reintroduced the RH for the year. Need to check manifolds. If you’re looking for a complete new engine for replacement there’s a few PCM 5.7 Excalibur’s left. And the power from those is beyond what you’ll get from the 351 in stock format. But at a price of $14k it’s probably a waste unless you’re a solid slalom skier. Going about to getting one I’m not sure but Florida Inboards would be a phone call worth making. Or Inboard Solutions in Indiana?

A reman 351 with new manifolds and risers, new intake, new carb, new distributor, new circulating pump, new carb, new starter and check and clean alternator and raw water pump and you should be in business for ~10 years at $3600 or so. Salt destroys everything and expect new manifolds every year. Closed loop cooling is an option but again exhaust will still rot.

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Please support The Cystic Fibrosis Foundation
1976 Ski Nautique 351 Escort
1993 Ski Nautique purple and black 351 HO PCM


Posted By: KENO
Date Posted: August-25-2019 at 9:00am
Originally posted by Orlando76 Orlando76 wrote:

Originally posted by Gary S Gary S wrote:

You sure you have a reverse rotation? What trans is in it?
1993 is almost guaranteed to be LH. ‘94 they sort of reintroduced the RH for the year. .


Almost but not quite, here's a quote from one of his old posts    

Originally posted by 93 Ski Nautique 93 Ski Nautique wrote:



My boat is actually one of the "base" boats. It does not have the ProTec, that was the higher horsepower engine right?

The boat has a 1.1 straight transmission, the engine is at an angle like the older ones, and it turns a 13x13 prop.

All wiring is original other than plug wires.


Posted By: Orlando76
Date Posted: August-25-2019 at 9:03am
Originally posted by KENO KENO wrote:

Originally posted by Orlando76 Orlando76 wrote:

Originally posted by Gary S Gary S wrote:

You sure you have a reverse rotation? What trans is in it?
1993 is almost guaranteed to be LH. ‘94 they sort of reintroduced the RH for the year. .


Almost but not quite, here's a quote from one of his old posts    

Originally posted by 93 Ski Nautique 93 Ski Nautique wrote:



My boat is actually one of the "base" boats. It does not have the ProTec, that was the higher horsepower engine right?

The boat has a 1.1 straight transmission, the engine is at an angle like the older ones, and it turns a 13x13 prop.

All wiring is original other than plug wires.


Like I said, almost.. that’s 2 93’s I’m aware of that are RH.

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Please support The Cystic Fibrosis Foundation
1976 Ski Nautique 351 Escort
1993 Ski Nautique purple and black 351 HO PCM


Posted By: 93 Ski Nautique
Date Posted: August-25-2019 at 9:40am
You sure you have a reverse rotation? What trans is in it? -

Yes, I believe so, looking at it from the front, the engine turns to the left, the firing order on the tag is 18456273, the model is PRD-PR-R10.

The trans is a PCM 1-1 that I believe they only used on the "base" boats that year. The engine has the angle to it like the older boats,   The output shaft rotates the same direction as the input shaft.

Could the problem just be exhaust manifolds or maybe you just want a new engine?   Boats run in full salt replace manifolds on a regular basis.

I wish it was just the manifolds, I have done the manifolds a few times on this engine over the years, always before I had an issue. Hoping this might be the problem now, and since the manifolds on the boat were about 5 years old I just replaced again, and I still have water going into the cylinder. To gain even more confidence in my diagnosis I slowly added water to the engine (not running, with the exhaust hoses blocked off) until it was full. I then cranked it over without the plugs in it and found cylinder #7 was taking on water.

This boat has always run perfectly, starts great, runs great. Incredible boat, I want to get it back running again ASAP:)

You sure you have a reverse rotation? What trans is in it?


Posted By: 93 Ski Nautique
Date Posted: August-25-2019 at 10:00am
Thanks for the responses folks. I do ski the course but I am lucky to run a 22 off pass, but I do pull some folks into 32/35 off occasionally. I can't really justify the $14k complete Excalibur engine for this boat and the factory 351 engine kept the shortline folks I pull happy.

Any recommended sources for a remanufactured long block if that's my only option? Michigan Motorz and Firstmate seem to have a good selection of marine engines.   


Posted By: KENO
Date Posted: August-25-2019 at 10:35am
How about ATK Performance engines in Texas.

DMA1R would be the model that should work for you. Reverse rotation one piece rear main seal, standard output 240 ish HP

They sell through Summit, Jeg's etc but if you call direct to ATK to check on availability , they'll probably hook you up with their Gearhead Engines branch that sells direct to the public and sometimes they have a 10% discount.

I've had good luck with them, shipping is free and fast.

Probably 5 days on a tractor trailer, it gives you time to pull the old one out, strip the parts you need and be ready for the new one.

Here's a link to their marine engine listing page

http://www.rebuiltmarineengines.com/assets/Docs/ATK_Marine_Catalog.pdf" rel="nofollow - link

Here's a lijnk to it on Summit's site

https://www.summitracing.com/parts/hme-dma1r/overview/" rel="nofollow - link

It's a newer block with a dipstick hole in the block, you have the dipstick in the oil pan and the block hole can be plugged.

It's about a 3/8 inch hole below and between the #7and 8 spark plugs, if you don't plug it oil mist will come out

A marine long block from anybody will be your fastest route to go assuming you figure your engine right now is toast.


Posted By: Gary S
Date Posted: August-25-2019 at 11:06am
You don't say where you are either but there is https://www.atlanticmarinestore.com/ford-5-8-351-windsor-engines/" rel="nofollow - Atlantic out of Miami also. Do your homework on all these guys. Would not be a bad idea to start gathering parts if you decide to retain the Ford- another iron intake manifold,complete thermostat housing,maybe even a timing cover from a worn out fresh water engine. Oil pan might be nice if you come across one too,there is no readily available parts source for these parts anymore. Exhaust manifolds and risers can last 7-8 years + if you flush after each and every use in pure salt water

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http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS
95 Nautique Super Sport


Posted By: Orlando76
Date Posted: August-25-2019 at 12:01pm
+1 for the ATK. I’ve done a Jasper, then an ATK, then a “high end” local rebuilder and the last rebuild which was for my 93 SN I went with the ATK again as I’ve felt they’ve been the best so far. I purchased through Summit. It arrived in maybe 5 days and I would go ATK for the next rebuild I might need.

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Please support The Cystic Fibrosis Foundation
1976 Ski Nautique 351 Escort
1993 Ski Nautique purple and black 351 HO PCM


Posted By: 93 Ski Nautique
Date Posted: August-25-2019 at 6:01pm
Excellent information guys, thank you very much. I have always flushed every time it ran in salt at all. It's been an amazing boat, unfortunately it started ingesting water earlier this summer and now has hydrostatic seizure after it sits over night. 2 years ago I had a couple of burned valves and I had the heads magnfluxed and a few new valves put into it. I will pull it apart to figure out where the leak is, but I would think heads or block are likely.

I am the original owner, we live in the Annapolis, MD area.


Posted By: 93 Ski Nautique
Date Posted: August-25-2019 at 6:02pm
I just purchased an intake manifold from Outlaw in Florida, I will work on the other parts and likely order an engine soon.

Thanks again!


Posted By: MrMcD
Date Posted: August-29-2019 at 2:45pm
If you had the heads done 2 years ago do you know if they used a Marine Head gasket?
In salt water automotive head gaskets would rust out quickly. Maybe you could pull the head and inspect before spending more money.
Does not take that long to pull a head and might save this engine.
If the one head gasket has failed you should replace the other head gasket also.
Pulling the head will show exactly where the gasket failed or you may find the head cracked, either way it would help to know.

Jasper Engines is another good source should you want a rebuild ready to go.
They are based in Jasper Indiana and have a good reputation.

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Posted By: Gary S
Date Posted: August-29-2019 at 3:18pm
I thought all felpro’s were stainless ringed now? I had use regular automotive felpro on my HM first time around with no problems, when I went with gtp’s and before I took it apart I decided to use Marine ones. Don’t know who made them, got them from skidim they Suspiciously looked oem Ford not felpro

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95 Nautique Super Sport


Posted By: MrMcD
Date Posted: August-29-2019 at 8:59pm
Most Automotive Fel-Pro are not stainless. Even the fire ring, the metal that surrounds the combustion chamber is mild steel until you upgrade.
The marine head gasket uses a stainless core and the fire ring is stainless also.
Everything else in the gasket is used to seal against water or oil leaks. The gasket body and fire ring seal your combustion pressure.
The first step over stock is the Severe Duty Gasket, these do have a Stainless fire ring but the gasket body is mild steel. Good gasket, much better than stock but not designed for Marine use.
I used automotive in my 351W, 1978 Nautique for 5-6 years and about 400 hours in clean water/ no salt with no failure but that was years ago and I chose to risk it saving a little money.
In brackish water, no brainer, use the Marine gasket.

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Posted By: KENO
Date Posted: August-30-2019 at 9:05am
Originally posted by Gary S Gary S wrote:

I thought all felpro’s were stainless ringed now? I had use regular automotive felpro on my HM first time around with no problems, when I went with gtp’s and before I took it apart I decided to use Marine ones. Don’t know who made them, got them from skidim they Suspiciously looked oem Ford not felpro


Check the link below Gary

It has a picture of a Ford marine OEM head gasket that I took out of a PCM 351w engine that had never been apart.

Part number D7JE-6051-AB stamped right into it.

A magnet is strangely quite attracted to it

http://www.correctcraftfan.com/forum/forum_posts.asp?TID=47578&title=gaskets-sets-for-full-rebuild" rel="nofollow - link


Posted By: 8122pbrainard
Date Posted: August-30-2019 at 9:12am
Gary,
400 series stainless has enough carbon in it that magnets will attract it.   

Originally posted by KENO KENO wrote:

Last time I put a magnet on a PCM original equipment head gasket I was kinda surprised because it was magnetic. Must be some of that 400 series stainless ]


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54 Atom

/diaries/details.asp?ID=2179" rel="nofollow - 77 Tique

64 X55 Dunphy

Keep it original, Pete
<


Posted By: KENO
Date Posted: August-30-2019 at 10:00am
Not being sure if a Felpro marine gasket is also 400 series or 300 series, I figured the only way to find out was to order a couple of FelPro 17060 351W marine head gaskets and give them the same magnet test.

I guess I'll know in a week or so

By the way, if somebody is looking for these gaskets, try Rock Auto Parts

19.84 each as a wholesaler closeout. So 2 for about 50 bucks when shipping is included

Not many left, so hurry up


Posted By: 93 Ski Nautique
Date Posted: September-01-2019 at 1:33am
I wish it was as easy as head gaskets. I pulled the heads myself and used gaskets from SkiDim so I think I am good to go there.

I will probably pull the head on the side that is leaking.

Folks around here say the engines last less than 20 years in this environment. However, when I pulled the heads 2 years ago there was surprising little rust in the heads or the block.   

I am perplexed that is leaking so quickly as things looked pretty good 2 years ago, but again, the rule of thumb around here is that engines last less than 20 years or so unless they have freshwater cooling on them.

I have not ordered the engine yet, trying to figure out all the logistics for the changeover first. Thanks again for the help guys!


Posted By: MrMcD
Date Posted: September-01-2019 at 4:05pm
Should have asked Ken, I have the Severe Duty 500 series and Marine gaskets in my garage if you wanted a test. The lower grade stainless is magnetic but not as magnetic as steel.
I used to know the grades but it escapes me now.

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Posted By: KENO
Date Posted: September-01-2019 at 10:07pm
Originally posted by MrMcD MrMcD wrote:

Should have asked Ken, I have the Severe Duty 500 series and Marine gaskets in my garage if you wanted a test. The lower grade stainless is magnetic but not as magnetic as steel.
I used to know the grades but it escapes me now.


I guess I'm just the type that likes to see things for myself and I can do some not terribly scientific but fun backyard hack testing to compare the two side by side with the same magnet.

Generally The 300 series is the non magnetic stuff and the 400 series is magnetic and will tend to rust too.

Generally is the key word here

Besides at less than 20 bucks each from Rock Auto right now I got some for a couple of friends engine projects that I'll be "helping" with after the season and an extra pair for myself to add to the parts collection.


Posted By: MrMcD
Date Posted: September-02-2019 at 1:01am
The 500 Series HD head gaskets are great gaskets for performance engines, the Stainless fire ring can hold up against detonation 3x better than standard steel.
They were developed to help Heavy working gas engines. Dump Trucks, tow vehicles etc.
They are flat pressed just like the performance and Marine but still use the standard steel body in the gasket. They are not much more money than a stock gasket. A good upgrade.


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Posted By: KENO
Date Posted: September-02-2019 at 10:03am
So.............what would be the part number for one of these 500 series gaskets for a 351w ?


Posted By: MrMcD
Date Posted: September-02-2019 at 4:41pm
Ken, 351 W no luck, part has been discontinued.
I just checked the Fel-Pro listing.

I believe these were available when the 500 series were created back in the early 2001.
Today the listings available for Fords are the 520SD for the 460 or the 525SD for the 300 6 cyl and the 4.0 V-6, no coverage for the 302, 351W sorry.
In GM you can still get the 500 series for the 350 501SD, 305, 454 early and late, 4.3L
The old 2.8L V6, the 3.1L V6, the old 2.5L 4cyl, which I believe would cover the 3.0L GM 4 cyl used in so many Volvo Penta boats and the generators.
The only Dodge covered is the 3.9L V6.

These were originally only sold to the large rebuilders who had hard working customers.
I know the 4.3L GM V6 was only added to help a customer that supplied UPS.   UPS had many 4.3L's and the drivers were pounding out the stock head gaskets.
Later Fel-Pro added them as a Heavy Duty or Super Duty option for sale to everyone but there were never really advertised.

I don't know if the lack of Ford Small Block coverage reflects the stock gaskets rarely fail or if the Ford head bolts do a better job of protecting the head gasket from failure.
If there was demand they would still be available.

460's were in many Motorhomes and hard working trucks so they are still available.
4.0L Ford V6 still available says it must have been a weak design and the rebuilders want a better than factory product.
The 300 Ford 6 part 525SD was also used in the old UPS trucks and many medium duty trucks and delivery vans, still available to buy today.
Looking at the part numbers available today there are many gaps.
Lots of parts were discontinued.
502-504, gone
506 and 507 gone
These were some of the first released parts but when parts don't sell enough volume they are discontinued.

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Posted By: KENO
Date Posted: September-02-2019 at 8:12pm
Originally posted by MrMcD MrMcD wrote:

Should have asked Ken, I have the Severe Duty 500 series and Marine gaskets in my garage if you wanted a test. The lower grade stainless is magnetic but not as magnetic as steel.
I used to know the grades but it escapes me now.


Maybe I shouldn't have asked

All that to say they don't make them

But now I know more about old UPS trucks than I really ever wanted to know   


Posted By: MrMcD
Date Posted: September-03-2019 at 1:23am
Allright nuckelhead,   I did not know your mechanical experience was limited to Ford Small Blocks.   I thought you might wish to know the GM options are still out there.

I felt bad for directing you to the 500 series only to learn I led you awol with no Ford small block coverage.   They really are a great gasket for the price, you just need to build a big block 460 or a Chevy!



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Posted By: KENO
Date Posted: September-03-2019 at 8:48am
Originally posted by MrMcD MrMcD wrote:

Allright nuckelhead,   I did not know your mechanical experience was limited to Ford Small Blocks.   I thought you might wish to know the GM options are still out there


Thanks Mark

I like it when I can get my morning laugh in early   

I won't say any more cause you'd probably take it all wrong

By the way, I'm really more of a chucklehead, or a knuckle dragger if you ask me





Posted By: KENO
Date Posted: September-03-2019 at 4:19pm
Originally posted by KENO KENO wrote:

Not being sure if a Felpro marine gasket is also 400 series or 300 series, I figured the only way to find out was to order a couple of FelPro 17060 351W marine head gaskets and give them the same magnet test.

I guess I'll know in a week or so

By the way, if somebody is looking for these gaskets, try Rock Auto Parts

19.84 each as a wholesaler closeout. So 2 for about 50 bucks when shipping is included

Not many left, so hurry up


Well, much to my delight the USPS brought me a package today. It was the gaskets I ordered from Rock Auto.

I figured that now I could compare the old Ford OEM marine gasket mentioned earlier in the thread with the brand spankin' new FelPro 17060 351W marine gasket.

Pretty easy to do

We'll start with the looks category FelPro wins hands down since it's brand new as compared to a 32 yearold well used Ford gasket

Then movin' on to the material category, specifically looking to see if the FelPro gasket is as magnetic as the Ford gasket. The FelPro advertising says that their marine gaskets are made of 300 series Austenitic stainless steel underneath the outer covering. (code for non magnetic)

Me and my trusty magnet held up the Ford gasket for a photo. It's quite magnetic.

What will happen with the FelPro was the big question. 300 series stainless would pretty much ignore that magnet and fall to the floor laughing at me.

I put the magnet on, held it up, took the same photo and it hung there just like the Ford gasket did

It took the same amount of force to pull the magnet off of either gasket.

Here are some pictures, you'll have to rotate them 90 degrees clockwise since the computer wasn't cooperating. The third picture is the FelPro package label







So much for that comparison I guess. Both would appear to have the same composition metal in them. Some 300 series that's magnetic or 400 maybe

If you have your doubts, just find a magnet and try it on one of these FelPro 17060 gaskets, it's pretty easy to do


Posted By: MrMcD
Date Posted: September-03-2019 at 4:38pm
Lower grade stainless is magnetic. Always has been but it does resist rust better than standard stamped steel and it is tougher.
The OEM gasket you show is a perforated core gasket this is the cheapest way to manufacture a head gasket and uses less metal in the core of the gasket.
The Fel Pro gasket is solid core they advertise 300 series stainless on the Core.
Should you overheat the solid core will resist crush better than a perforated core gasket.
They also resist pound out in detonation far better than a perforated core gasket.
All Performance gaskets are solid core.   
In the picture shown it looks like the OEM gasket failed between all cylinders.
Was this an overheated engine or bad tune induced?

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Posted By: KENO
Date Posted: September-03-2019 at 5:13pm
Originally posted by MrMcD MrMcD wrote:

Lower grade stainless is magnetic. Always has been but it does resist rust better than standard stamped steel and it is tougher.
The OEM gasket you show is a perforated core gasket this is the cheapest way to manufacture a head gasket and uses less metal in the core of the gasket.
The Fel Pro gasket is solid core.
Should you overheat the solid core will resist crush better than a perforated core gasket.
They also resist pound out in detonation far better than a perforated core gasket.
All Performance gaskets are solid core.   
In the picture shown it looks like the OEM gasket failed between all cylinders.
Was this an overheated engine or bad tune induced?


The gasket was out of a perfectly good running engine that got some GT40P heads and a new manifold, cam etc Normal compression no failures

It was sealed rather well and was hard to peel off if you really must know

Just pointing out the same "cheap" SS used in the FelPro gasket as the Ford gasket.

How many times in this thread has it been said already that lower grade SS is magnetic?

Why don't you be useful and ask your FelPro connections why their 300 series is magnetic ?

The Ford gasket lasted plenty of years and hours with no issues and I imagine the FelPro will too.









Posted By: KENO
Date Posted: September-03-2019 at 5:23pm
Here are a couple of links you can look at Mark

https://www.felpro.com/parts/marine/head-gaskets.html" rel="nofollow - link

https://www.summitracing.com/parts/fel-17060/" rel="nofollow - link

Maybe it's generic advertising about 300 series SS being used.

I'm sure you can find out for everybody


Posted By: MrMcD
Date Posted: September-03-2019 at 5:43pm
There are about 16 grades of Stainless within the 300 series. Some are magnetic and some are not. The ingrediants vary in each grade to achieve the compound requested.
Some are harder some are softer. Some are brittle and some are flexible. Each application has its own needs and cost always comes into the fray.
In your picture of the OEM head gasket it shows black between the cylinders if the photo actually shows it accurately. The only thing that turns that black is combustion blowing between cylinders. That only happens after an overheat or in severe detonation. Those areas should match the rest of your gasket. If your engine was still running great I will put it down to a bad picture.
I have seen gaskets go from looking like yours to burned right through in the same areas yours is black.

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Posted By: MrMcD
Date Posted: September-03-2019 at 8:38pm
This gasket is out of a Chevy 400 Small Block. these are known to run hot between the center cylinders. This one has more than 30,000 miles since rebuild and it was raced many times,   30,000 miles is what in a boat? I suspect at least 4-600 hours.
Look at the Fire Rings, the silver circles around each cylinder. The Fire rings in this gasket are stock so standard steel wrapped fire rings, not stainless which would be better for this use.
Notice how they are silver all the way around even at the area where the cylinders are side by side.   The side by side are the hottest in a Chevy, the center two cylinders exhaust valves are side by side at this spot and they run extra hot in this area. This gasket has no sign of blowby or combustion leakage between cylinders or signs of heat.
This is what you should see on a good engine tear down.
I tried to take one picture from a similar angle to the pictures you posted so you can compare.
Any time a fire ring is black it is compromised. Combustion fire is blowing over the surface.
In a car when the head gasket fails it can cause the radiator to over pressurize.
In a open cooling system boat it goes unnoticed until something else fails or you start fouling plugs.
Edit: for some reason the 3rd picture is not showing?

IMG]uploads/14769/IMG_1110.jpg[/IMG]

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Posted By: KENO
Date Posted: September-03-2019 at 10:44pm
we'll just call it a bad picture of the Ford gasket, the silver shows all the way around in real life and like I said, it ran fine, compression was fine. I'd guess the silver gasket material color has something to do with what it appears to show as leakage between all cylinders

I tried to talk the owner into leaving it alone but he wanted some more oomph

It was in his family since day 1 and never overheated, and well maintained with about 2500 fairly tough hours on it.

So since you're into explaining thingslet's hear why the top and bottom of a FelPro 17060 are different in the sealing areas between fire rings.

Just color me curious

The 2 pictures should be self explanatory





Posted By: KENO
Date Posted: September-03-2019 at 10:59pm
By the way, I've been having fun today with my magnet on things like SS kitchen sinks and dishwashers and refrigerators and nuts and bolts at that place that Pete works at.

There's some pretty magnetic SS out there even in the 304 typically non magnetic series, so I'm going with the thought that they're using kitchen sink material in Marine head gaskets no matter what company we're talking about.


Posted By: MrMcD
Date Posted: September-04-2019 at 1:12am
We are so far off topic for the original post, I want to apologize but his post did start this so it is his fault!     
On your question about the gasket difference what you are seeing is a reinforcement.
You will see that if a certain area of a gasket is exposed to more heat or pounding.
It is reinforced in that area to help the gasket live longer.
Some engines have areas that are known to be failure areas so Fel-Pro will beef up those areas or change materials trying to help out.
The 351W uses a nice pattern of intake exhaust for the valve layout which should help cool the head evenly but in my experience they won't add reinforcement just for practice, it is to offset some known problems based on feedback from the customers.
In normal operation at full throttle the head can lift slightly from the combustion pressure. Wide open throttle pressure is about 600 PSI in the chamber. If the head design allows some areas to move more than others it can induce what they call pound out. Failure due to the head jumping up and down, it is like pounding with a ball pen hammer on steel, The first whack does not do much but if you do it 10,000 times it can start pounding the gasket out.
The Toyota 22R 4 cyl was famous for this failure, the Fel-Pro design gave extended life in that engine using a reinforcement like the one in the picture you posted.
Some designs do not need help, others like the 351W do evidently.
The amount of movement due to combustion is minimal, maybe less than .001 per explosion but it is the long term effect that can cause failures.
If you get detonation going on due to too much timing or a lean burn conditon the combustion pressure can jump up to 3,500 PSI or more, the amount the head moves can jump up over .003. That is when you really see some pound out quickly along with gasket failure and maybe piston/piston ring failure.
New engines like the new GM LS engines, 4,8L, 5.3L 6.0L, 6.2L and just about any other new manufacturers engine is casted so light today that they see movement of .002 to .003 in normal operation. That is why they all use the new Multi Layer Steel head gaskets.
Each layer of a Multi Layer Steel gasket (MLS) offers about .001 protection against movement.    3 or 4 layer gasket would offer .003 or .004 protection against head lift.
The engines will not run long at all wthout this type gasket protection but you see these same engines running MLS go 300,000 miles without a failure so the new tech is working.


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Posted By: KENO
Date Posted: September-04-2019 at 6:47am
Originally posted by MrMcD MrMcD wrote:

    
On your question about the gasket difference what you are seeing is a reinforcement.


I guess they decided to make a weaker gasket then, since the Ford gasket has the "reinforcement" between each cylinder on one side   

And why's it only "reinforced" on one side of the gasket?   


Posted By: KRoundy
Date Posted: September-04-2019 at 12:42pm
I'm curious is the original topic for this issue has been resolved. I know of a 1993 RR Ski Nautique that is on my local lake (Lake Stevens, WA). It is fun to look at and compare to my 1993 standard rotation 1:23 boat. The RR boat is a true "bare bones" ski machine. No rear seats, no side pads, etc. It's like my boat, but stripped down to just what you need to ski.

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Previous: 1993 Electric Blue/Charcoal Ski Nautique
Current: 2016 Ski Nautique 200 Open Bow


Posted By: MrMcD
Date Posted: September-04-2019 at 3:46pm
I remember the bare bones Nautiques being sold, they were trying to get close to the lower priced Malibu, Centurian, Sanger and other newer entries back then.

Ken, you do know that Ford does not make gaskets. That gasket either came from Victor or McCord, McCord is owned by Federal-Mogul who also owns Fel-Pro and Victor is now Victor Reinz and German owned. Those two have the high volume production machines that can kick out the volume needed by OEM demands. If you like the design check out the Victor offering, it may match. McCord only provides to OEM no aftermarket and it has not been under the McCord name since about 2002.

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Posted By: KENO
Date Posted: September-04-2019 at 4:59pm
One thing I do know is that you're avoiding the question about the "reinforcement"


Posted By: JoeinNY
Date Posted: September-04-2019 at 5:29pm
Originally posted by KENO KENO wrote:

One thing I do know is that you're avoiding the question about the "reinforcement"


You can't do that top and bottom on the same cylinder and still manufacture it, and I don't see why it would matter if it was on the top or bottom ?



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http://www.correctcraftfan.com/diaries/details.asp?ID=1477 - 1983 Ski Nautique 2001
1967 Mustang 302 "Decoy"
http://www.youtube.com/watch?v=cO5MkcBXBBs - Holeshot Video


Posted By: KENO
Date Posted: September-04-2019 at 5:40pm
Well when you get right down to it the question was about the "reinforcement" or really the lack of. reinforcement between the 2 middle cylinders on the FelPro gaskets like you can see in the pictures.

The Ford marine gasket has reinforcement between all the cylinders


Posted By: 93 Ski Nautique
Date Posted: September-05-2019 at 12:00am
Well, I ordered the ATK motor today guys. I'll be pulling the bolt-on parts off mine soon. They said 7 - 10 days on the delivery.

On the base boat, if you look in the 1993 Waterski magazine buyers guide I think they tested the "base" boat and the regular boat. My boat has no padding on the engine cover or down the sides. Thanks for all the help, wish me luck:)


Posted By: aupatking
Date Posted: September-05-2019 at 12:56am
My ski partner just repowered his 93. He was goin* to make the old ProTec a GT40, but ended up finding a full GT40 bobtail. A little while back he was looking to sell a full GT40 fuel injection system setup. As I understand it, it was everything you need to make it a GT40 except the heads and cam. I’ll say his stripped down 93 with 310hp is a racehorse!
I can check to see if he still wants to sell, pretty sure he does.

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02 SN 196 TSC2 ZO
01 SN 196 TSC1
98 SN 196 TSC1
97 SN 196 TSC1
93 SN 196 NWZ



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