1974-351 windsor intake

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.

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.

Hey the kids like the tube.

And how much are they???

And just what is wrong with tubing at 50mph ??
Other than the obvious of it being deadly...

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.

The more I research the more I want the Weiand Stealth. What kind of gain will the have over the stock intake?

that was my first thought Pete, if i were a betting man....

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.

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.

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.

Cslaten33 wrote: The engine going back into the boat is a LH rotation the sa e that came out. The cam is to as well

So the engine that came out wasn't the original engine ether.

Gary S wrote: 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?

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.

PAPA wrote: 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.

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.

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