port e7 heads or gt-40p heads?

5667 Views 10 Replies 8 Participants Last post by Bullitt95, May 10, 2008

mr.mustang214

Discussion Starter · May 8, 2008

I'm running a 302 with stock intake, 70mm tb and b303 cam. I was wondering which would be best on budget and performance, port my e7 heads and install 1.7rr's, or find gt-40p heads to install. Also, is it true that my bbk shorty headers won't fit on the gt-40p heads? Any advice would be greatly appreciated, thanks!

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Mustang_Crazy69

· #2 · May 8, 2008

the P's have a relocated spark plug i got them but im gonna have them ported also should wake the best

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AT68

· #3 · May 8, 2008

I didnt think headers would fit with the GT40Ps?

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tom.moss1949

· #4 · May 8, 2008

either will work well, I'd buy the set that was the cheapest all else being equal (freshened up of low miles). The stock headers will work, but changing plugs will be a PITA and 90 degree plug boots and wire management will be a requirement.

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EagleAutosports

· #5 · May 8, 2008

Yup, 90 degree boots and maybe even some boot protectors will prevent them from being burned.

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Mustang_Crazy69

· #6 · May 8, 2008

i burned my #2 off with them the way they are but i do have straight boots can you buy 90 bots to change them or do you have to buy a set of wires

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Bullitt95

· #7 · May 9, 2008

mr.mustang214 said:
I'm running a 302 with stock intake, 70mm tb and b303 cam. I was wondering which would be best on budget and performance, port my e7 heads and install 1.7rr's, or find gt-40p heads to install. Also, is it true that my bbk shorty headers won't fit on the gt-40p heads? Any advice would be greatly appreciated, thanks!

I ported my own E7 heads and factory lower/upper intake, kept the stock cam, and added Crane 1.7 RR's. Ported E7's work well but still not as good as GT40P's. The only thing that puts me off the GT40P's is the difficulty in changing the spark plugs. I have MAC long tubes which, I believe, will fit on the GT40P's. Maybe someone can confirm if that's the case.

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tom.moss1949

· #8 · May 9, 2008

changing my plugs is no problem - but I have MAC headers for the P heads.

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samotrx7

· #9 · May 9, 2008

Bullitt95 said:
I ported my own E7 heads and factory lower/upper intake, kept the stock cam, and added Crane 1.7 RR's. Ported E7's work well but still not as good as GT40P's. The only thing that puts me off the GT40P's is the difficulty in changing the spark plugs. I have MAC long tubes which, I believe, will fit on the GT40P's. Maybe someone can confirm if that's the case.

I have mac long tubes on my car with the p heads and they all fit, the only one that is a little tight is the #4 plug and its not bad I jus dont have space to slip over a spark plug socket on it but they all clear pretty good.

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95fiveoh

· #10 · May 10, 2008

Go with the gt-40's. I had ported and milled e7 heads w/ roller rockers, plus I added a cam and only knocked off 2/10's of a second in the 1/4 mile.

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Bullitt95

· #11 · May 10, 2008

samotrx7 said:
I have mac long tubes on my car with the p heads and they all fit, the only one that is a little tight is the #4 plug and its not bad I jus dont have space to slip over a spark plug socket on it but they all clear pretty good.

That's good to know 'cause I reckon even unported GT40P's will be worth 15-20rwhp over my ported E7's without a loss of low rev torque. Since my goal is to have a high torque engine similar to Tom's (tmoss), I think I'll start looking around for a pair of those heads.

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