And so it begins...

gun-driver wrote: They're D00E heads with the larger valves, they are from the '69 - '70's era. D00E Specs: 60cc Chambers 1.84" Intake Valves 1.54" Exhaust Valves Port Size: 1.94"x1.76" Intake 1.24"x1.00" Exhaust

that is almost the correct factory specs 58cc cambers, and 1.45 exhaust if my memory is correct, but these are not the correct specs for what you actually have, they have been tweeked.

horkn wrote: It depends if they are DOOE-B heads which had 1.78 intake valves, and 1.45 exhaust valves. These were 58.2cc. The D0OE-C heads had 1.84 intake valves, and 1.54 exhaust valves with 60.4cc.

I'm sure you know much more about the heads in his possesion than I do..... but I'll bet 10 grand you don't.

tell me what lift the springs are rated for?

tell me what type of rockers he is using?

tell me the size of the valves in them?

tell me how much you don't know about them.

Tom that may all be well and good but Chris is intimately familiar with the particular set in question. Before his Sea Ray days, Chris used to own a boat, and in an attempt to hang with the big boys, he planned to use the heads in question. Since then he sold off his toys and now Paul's boat should run pretty decent.

Paul, the boat looks great. I assume by "multi-surface epoxy" youre referring to the stuff made by Quikrete?

Paul,
Since I didn't post before on this thread, I don't know who he was baiting.


Regardless, you have been doing awesome work so far and I'm sure it will look beautiful when it's done.

gun-driver wrote: And referring to the very first post... Hundred hours of labor a couple thousand dollars in material being able to ski behind it with my daughter PRICELESS!!!!

Absolutely!! Fantastic!

How about how it's performing?

Dont even consider putting the 1442 on that 1:1 boat if youre not getting enough RPM's out of it. Thats a 1.23 prop and your '85 will not appreciate the extra 3" of pitch.

Im surprised youre only seeing 4600 RPM out of that combo... Ive seen bone stock 2001's run dead on 4400 with a 540. Keeping up with a 1.23 HO 351w boat as fast as your '95 (48 is very strong) is impressive though. Refresh my memory- what do you have for a cam? That will play a large role in determining what WOT RPM you should be running to maximize your performance.

I wouldnt bother sending the prop back to be reworked. 5000 is really the target you should be shooting for on a stock HO 351w. I doubt the added cup is whats causing you to lose the 1-2mph... more likely it has to do with conditions at any given point, and perhaps the prop isnt quite as accurate now that its been repaired. 46-47 is still plenty strong for your combo.

If you get a chance to post the CR266 specs, that would be interesting to see. I would have expected your '85 to be flirting with 50.

Ok, .450/.450 is on the conservative side. That is, unless youre running 1.7 roller rockers (which would put you in the .478 range). For comparison purposes, my '90 has .490/.490. Even still, if those heads are equivalent to GT40's, those alone should have you turning in the 4800-5000 range, especially with a 540.

Unless those heads just arent what theyre cracked up to be, I think youre leaving something on the table- Im just not sure where.

Edit- dumb question... I just noticed youre looking for the adapter to attach your throttle cable to the carb. Im not sure how you have it set up now, but have you made sure youre getting full throttle extension with the cable?

50 is a very tough nut to crack on that hull I dont think that engine is drastically underperforming its' parts at this point. It took 400 hp (actual dyno HP) for me to get my 83 to 52.x mph. I was right at 50.x with my back up engine last year but that was with aftermarket heads, more aggressive roller cam, port matched manifolds, and an insanely overkill ignition and fuel system for the application. I don't know that we ever got back final speed numbers from akabulla on his 330 hp excal 83 build up but his last estimate was right at 50.. I dont see anything in this build that would be targeting 330 hp. A big cam relatively small prop and some serious rpms would do it.. but that wouldn't necessarily be as fun a boat.

The boat and engine look great and should be solid for years.. congrats on getting through it. Getting your daugher/helper up on ski's next to you is not only priceless by timeless, having those pictures of her with the toolbelt and then later skiing is just unbelieveable history to have.. well done.

IMHO not the best cam choice for the heads, Those heads need more RPM's and more lift and duration to take advantage of them. You did balance the rotating assemble? and ported them too?

Can you please clarify what model boat you have? There are Mustangs and there are Skiers, but they are different models.

As far as the bilge goes, Paul confirmed he used this, followed by a layer of clear:

TRBenj wrote: Paul, the boat looks great. I assume by "multi-surface epoxy" youre referring to the stuff made by Quikrete?

those heads where set up for over .500 of lift and 5500-6000 rpm so maybe I'm not following your numbers or comparing them correctly.

Sorry I am late chiming in. Like Joe said I have a 330 hp Excalibur in my 82 with a new floor and stringers so there is no extra weight from soaked foam. Now I have only tried my 422 4 Blade Acme but I get right at 47. I haven't tried any other props because the hole shot with this is great and all I really care about is getting out of the water for boarding. Maybe with a different prop I could hit 50 but not sure.

With 3 people in the boat my RPMs match my speed almost dead on. 3000 = 30, 3500 = 35 etc....

gun-driver wrote: I told the guy at C/R the specs you sent me along with the type head's and valve/valve springs specs and he basically said I know what you need.

Did you fail to mention that you had a 351w? Thats something they should have asked. If not, its possible they assumed you have a 302- those specs are nearly identical (.450/.450, 206/212) to the cam CR recommended for my sister's Mustang- which has a 302 and GT40p heads that they intend to turn up to 5k RPM. Maybe there was a (pretty major) miscommunication?

When selecting a cam, you need to know everything about the application its being installed into- cubic inches, compression ratio, heads, intake, weight of the vehicle, intended use, etc.

I was wondering if it could be a fuel delivery problem (as in not enough)causing the low max rpm. So before I called C/R I pulled a plug and its white as could be.
So any ideas if the low rpm could be caused by getting a lot more air/not enough gas since the mods.
If so where do I start, larger jets?