GT40 heads on a 331 stroker?

[dhinch279]

I'm just curious if anyone has done it before and what their results were. I'm not looking for 500hp or anything, in fact I would be content with starting out around 300hp and increasing it as I go. I just sent my 91 roller block over to the machine shop and he gave me a good deal on a 331 stroker kit. I originally was not going to stroke it but he was able to locate a stroker kit for not much more than it would have cost me to do an all forged 306. Anyway, I got a set of GT40 heads, intake, and throttle body off of a 1996 Explorer all for $75, so I have decided to go ahead and try it out. My machinist said that it will definately be the bottleneck of the entire setup but that it will still be a huge improvement compared to what it was before and it will give me room for improvement later if I feel the need for more HP.

 

[Teddyzee]

They were used on the 1st gen Lightning (with a 351), so they should work okay. Slightly better than E7 heads.

 

[fordmike1]

I'm just curious if anyone has done it before and what their results were. I'm not looking for 500hp or anything, in fact I would be content with starting out around 300hp and increasing it as I go. I just sent my 91 roller block over to the machine shop and he gave me a good deal on a 331 stroker kit. I originally was not going to stroke it but he was able to locate a stroker kit for not much more than it would have cost me to do an all forged 306. Anyway, I got a set of GT40 heads, intake, and throttle body off of a 1996 Explorer all for $75, so I have decided to go ahead and try it out. My machinist said that it will definately be the bottleneck of the entire setup but that it will still be a huge improvement compared to what it was before and it will give me room for improvement later if I feel the need for more HP.

We put a set of GT40's on a 392 stroker with a F-cam and a Lightning intake with long tubes and a dyno tune and made 384hp at the tires in a 90 coupe Mustang. The trans is a C4 with a 3k converter and 4:10 gears in the rear. He could have made more HP but built all of this on a real tight budget. I would think that they will make good HP on a 331ci also.

 

[dhinch279]

Nice, I will be porting and polishing the intake and heads, nothing really serious, just a gasket match. I already have the long tubes on the car. By the way, this engine setup isn't going into a ranger either(although I wish I had the money to do that too). It's going in my 1989 Saleen Mustang. Maybe I should start a build thread, I guess Jim wouldn't care.

 

[TRX501RYAN]

I just picked up a set of gt-40s my self, and planning to put them on the 347 im buidling, im hoping they do alright, i just cant spend 1000+ on some better heads right now, and still put the motor in the truck lol... well see how they fair.

 

[bahndrvr]

They are alright wil lbe the limiting factor, Edelbrock has some new E-series heads out that are under 1g with Everything that I will be putting on my Forged 306 that I will be puttin in the ranger, but we are at least a year away from that

Have had ton's of stangs and several builds of the 5.0 before I switched to the Modular world

I put down 340rwhp through a set at one point in time iwth a TMoss Ported GT40 INtake manifold so it's possible, but they fall off in the upper RPMS.

 

[TRX501RYAN]

Im sure they will be a bottle neck, but im gonna do with unless i find a killer deal on a better set of heads....


The heads i bought these from, turns out they were lasted used in a V8 ranger, 306, that made 460 on the flywheel, this isnt coming from the guy i bought them from, but from a friend of mine who knows the previous owner... if that is true, and i match the #'s with my 347, i will have more then enough hp in a ranger for what i am doing... i hope lol....