GT40P Heads Good?

[hbk_136]

I was thinking about buying a pair of GT40P heads to replace my current heads. As you can see from my sig, i have a set of completely redone, ported, and milled E7 heads. Does this sound like a good move, (HP-wise)? Will these GT40P heads outflow my ported and milled E7's? Can someone out there with GT40P heads give me some feedback on their performance? I appreciate any help, :worship: :worship:

 

[TrophyHead]

www.thumperoforangepark.com Check this out.

I'f you port and polish those GT40P heads they will be great. But if you leave the GT40P heads untouched you won't gain that much more HP.

 

[TrophyHead]

My mistake Thumper was talking about the GT40X heads. But check the site out anyways.

 

[hbk_136]

Interesting, but right now i just need to know about GT40P heads. But thanks for the reference, i live close to orange park so i can get them to port my heads for me.

 

[MustangMulch]

I thought thumper's heads outflowed stock gt40p's??

 

[Michael Yount]

hbk - what do your heads flow? We can't tell you how they'll compare with the P's unless you can tell us what your flow numbers are.

 

[hbk_136]

Yeah, that's the problem. I bought the car with them already on, i don't know the #'s. I will email the guy to see if he knows.

 

[Horsepower67]

I have set of "P" heads on a pretty nasty carbed 351W in my '67 Ranchero GTA. One thing, the "P" heads have smaller valves than most aftermarket heads. I think the valves are probably way too small for this engine, but it does make pretty killer power overall and revs very quickly. I do have to watch out for detonation a lot since they're iron and I'm running 11:1 compression.