1974-351 windsor intake |
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Cslaten33
Senior Member Joined: December-21-2009 Location: Tulsa, OK Status: Offline Points: 150 |
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Posted: January-12-2010 at 5:18am |
Guy I have a 1974 Ski Nautique. Im putting a new 351 Windsor in it. I have beefed up the cam and now Im stumped on what intake I should use. Please help.
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Thanks Clark Slaten
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81nautique
Grand Poobah Joined: September-03-2005 Location: Big Rock, Il Status: Offline Points: 5778 |
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Edelbrock Performer, Performer RPM and Weiand Stealth are popular choices. Depends on what you want the boat to do, pull skiers, go fast or both. Give us some details on cam and heads you put on.
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You can’t change the wind but you can adjust your sails
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Cslaten33
Senior Member Joined: December-21-2009 Location: Tulsa, OK Status: Offline Points: 150 |
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I would like to have all the power I need to pull skiers and tubes. But I also want the boat to go 48-50. Really My god father has a Master Craft its a 205 with a LS-1 engine. I he runs like 49.6 MPH I would like to out run him. My 74 ski nautique was his very frist boat.
Thanks Clark Slaten |
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Thanks Clark Slaten
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lewy2001
Grand Poobah Joined: March-19-2008 Location: NSW Australia Status: Offline Points: 2234 |
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Put some GT40P heads on with a good intake and you should smoke that Master Craft.
As Allan suggested any of those choices should be fine Summit also have a clone that looks good value. |
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If you're going through hell, keep going
89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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And what??? Clark, this certainly must be a misprint. Please don'r tell me you are serious!!! If you are serious, you sure are going through alot of effort for a tubing boat!!! |
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Cslaten33
Senior Member Joined: December-21-2009 Location: Tulsa, OK Status: Offline Points: 150 |
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Hey the kids like the tube.
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Thanks Clark Slaten
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Cslaten33
Senior Member Joined: December-21-2009 Location: Tulsa, OK Status: Offline Points: 150 |
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Where can I get the GT40P heads?
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Thanks Clark Slaten
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Cslaten33
Senior Member Joined: December-21-2009 Location: Tulsa, OK Status: Offline Points: 150 |
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And how much are they???
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Thanks Clark Slaten
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Tri State Cylinder Heads GT40p
This is where some of us got them. Here is another Clearwater They are if I remember right around 250 ea for stock rebuilt ones |
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critter
Platinum Member Joined: January-11-2008 Location: New Hill, NC Status: Offline Points: 1227 |
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And just what is wrong with tubing at 50mph ??
Other than the obvious of it being deadly... |
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1980 Ski Nautique
1966 Barracuda |
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critter
Platinum Member Joined: January-11-2008 Location: New Hill, NC Status: Offline Points: 1227 |
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If you are going to pull the heads, go ahead and put a Cam Research Cam and lifters in it too.
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1980 Ski Nautique
1966 Barracuda |
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Cslaten33
Senior Member Joined: December-21-2009 Location: Tulsa, OK Status: Offline Points: 150 |
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Critter I have already paid for a better cam and lifters. They are sitting in the shop ready to go in. I will tell you what the cam is tomarrow. I can not remember off the top of my head and I really dont want to go out to the shop and look right now. Although it is warming up here in Tulsa, OK.
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Thanks Clark Slaten
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Cslaten33
Senior Member Joined: December-21-2009 Location: Tulsa, OK Status: Offline Points: 150 |
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Damn $600 for the heads. I think I will stay with what I have. LOL
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Thanks Clark Slaten
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Cslaten33
Senior Member Joined: December-21-2009 Location: Tulsa, OK Status: Offline Points: 150 |
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The more I research the more I want the Weiand Stealth. What kind of gain will the have over the stock intake?
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Thanks Clark Slaten
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Clark,
What rotation is the 351 you're putting in the boat? Talking about the cam you have, you what to make sure it's correct. Get the kids up on skis or a board next summer. You'll find they will enjoy it even more. It's challenging and will develop skills. |
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eric lavine
Grand Poobah Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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that was my first thought Pete, if i were a betting man....
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"the things you own will start to own you"
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lewy2001
Grand Poobah Joined: March-19-2008 Location: NSW Australia Status: Offline Points: 2234 |
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Clark I noticed you have the original long motor in the for sale section.
Is the replacement engine a marine reverse rotation or a automotive long block? Have you run the engine in the boat yet it may require a LH prop if it is. Like Pete and Eric said what cam do you have RH or LH rotation. The Stealth manifold is 2.5" taller than the stock and may require a lower profile arrestor to fit under the engine cover. |
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If you're going through hell, keep going
89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
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PAPA
Senior Member Joined: October-06-2009 Location: Fremont, In Status: Offline Points: 202 |
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Clark, I put a Edelbrock Performer RPM on my 1977 with a K & N #59-3264 flame arrestor to make sure the engine box cover would still fit.
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Online Points: 21166 |
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FYI, that K&N filter may only have a 2" element, but has an overall height of 3.75". Its probably taller than the stock arrestor (usually 3"). You can barely squeeze on a 2" arrestor over the carb overflow tubes, but its an option if clearance is an issue. Either way, I wouldnt recommend the K&N- especially considering the price and performance increase (none). Im not sure theres much to be gained with an intake change alone. Youre talking maybe 5-10hp, tops. If staying with the stock heads, its probably not worth going more aggressive than the standard Performer. The RPM or Stealth are great intakes if upgrading your whole top end (head/cam/intake). |
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PAPA
Senior Member Joined: October-06-2009 Location: Fremont, In Status: Offline Points: 202 |
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Tim, as Clark said, he has the new cam, so why not put on the RPM? He can always do the heads or other more aggressive upgrades later and then you already have a good intake. As you said, not much to be gained if putting it on by itself with stock everything else. As for the K&N; my boat had a huge 5+ inch flame arrestor probably put on by a previous owner for some reason and I needed the clearance on my application. You have to admit it sure looks better than a stock one.
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Online Points: 21166 |
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The K&N looks good, but there are stock arrestors that look better, IMHO! The SS Barbron ones are pretty nice.
The heads are the major choke point on the 351w... if you were only going to do one thing, that would be it. Changing the cam and the intake really doesnt make any sense by themselves. If he was smart and wanted to save money, then he would have bought one set of gaskets and done the heads, intake and cam at the same time. That would have gained him 80hp for $1200 (gaskets included) and pushed him into the low to mid 50's. His combo now (cam and intake) probably cost almost half of that with the gaskets and will only gain him 15-20 hp, tops. I stand by my advice! |
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81nautique
Grand Poobah Joined: September-03-2005 Location: Big Rock, Il Status: Offline Points: 5778 |
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I'm waiting to see what the cam specs are and I was going to run a desktop dyno for him with the stock heads and the a comparison with the gt40p's.
I'm with Tim on this because you get 2 things with the Gt40p's, one being better breathing and 2 being almost a full point increase in compression ratio. The heads alone are worth approx 40hp. The cams not going to make a huge difference if the restrictions are there with stock heads, you could do a little home porting on the stock heads but it's not going to get you much. Without changing heads I would not spend the money on an aftermarket intake. I took some heat for stating that on another thread but I still feel it's a waste of money even if this is a hobby. When it comes down to decision time on the intake I prefer the RPM over the standard performer BUT I like Summits clone of the RPM because you don't need the crappy adapter plate for the square bore Holley carb eliminating a possible vacuum leak and a second gasket. I know Tim runs a Stealth and I don't think you need the adapter for that intake either. I stay away from Edelbrocks simply for that reason. |
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You can’t change the wind but you can adjust your sails
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Cslaten33
Senior Member Joined: December-21-2009 Location: Tulsa, OK Status: Offline Points: 150 |
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The engine going back into the boat is a LH rotation the sa
e that came out. The cam is to as well |
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Thanks Clark Slaten
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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So the engine that came out wasn't the original engine ether. |
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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[QUOTE=81nautique] I'm waiting to see what the cam specs are and I was going to run a desktop dyno for him with the stock heads and the a comparison with the gt40p's. QUOTE]
Some time I have to have you run mine Alan, after all that work I did on mine last spring I didn't even pick up 1 mph.Low to midrange seems to have picked up. I need to get ahold of Reid or Matt to see about a prop next. What info do you need to run it? |
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Online Points: 21166 |
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Didnt you try a 12x13 OJ, Gary? That prop should have pushed the boat well. I like the Acme 1210 better on my Skier, but both are good wheels. The one detractor to installing the P heads on the earlier 289/302 is the drop in compression you'll see. Flow should be much better. I think if you tell Alan which intake youre using and get him your cam specs, he can run the software. |
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PAPA
Senior Member Joined: October-06-2009 Location: Fremont, In Status: Offline Points: 202 |
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Clark, believe it or not, guys were putting in cams and intakes on this motor for over twenty five years before the GT40P heads even came out and I am sure a lot of them got more than a 15-20 horsepower pick up. It will depend on your cam grind on how much you will pick up. I can understand with the new long block on not wanting to buy another set of new heads at this time. Just remember, the RPM and the Stealth will both work with the cam and any future head install.
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Online Points: 21166 |
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The heads in question arent the P heads- its the terrible flowing 302 based E7 ones that came on the stock 351w marine engines! Better heads have existed for the 351w since the very early days- the 1969+ D0OE heads come to mind. You dont have to take our word for it though- Alan will run the desktop dyno once he is given the cam specs. |
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Cslaten33
Senior Member Joined: December-21-2009 Location: Tulsa, OK Status: Offline Points: 150 |
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http://www.compcams.com/Cam_Specs/CamDetails.aspx?csid=889&sb=2
Here is the hyper link with all the specs for the cam that I am going to use. unless you guys think I should go with something else. Thanks Clark Slaten |
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Thanks Clark Slaten
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Cslaten33
Senior Member Joined: December-21-2009 Location: Tulsa, OK Status: Offline Points: 150 |
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What is a set of brand new 351W heads worth?? Never ran. Straight from the factory? If someone needs them or wants them. I will sell them so I can get the GT40P heads.
Thanks Clark Slaten |
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Thanks Clark Slaten
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