GT-40P's VS GT-40's?

LilBerx · Mar 24, 2012

What's the difference? Let's hear the cons an pros.

srtthis · Mar 24, 2012

P flow better
P have bad spark plug angle

85_SS_302_Coupe · Mar 24, 2012

"Bad spark plug angle"? It was revised to aim the plug towards the center of the combustion chamber to improve combustion. I wouldn't call that a bad angle, but it does create header clearance issues. P's require specific headers. Non P's don't. Some full lengths will work on P heads without spark plug clearance issues. P's actually have slightly smaller exhaust valves and ports, but flow better because of better velocity.

stykthyn · Mar 24, 2012

Dollars to donuts your butt synopsis won't tell the difference between the two.

Boosted92LX · Mar 24, 2012

I got a pair of ported bare of p castings in my garage i got as payment for something...and i dont know if they're worth the money for hardware and machine work...

LilBerx · Mar 28, 2012

85_SS_302_Coupe said:
"Bad spark plug angle"? It was revised to aim the plug towards the center of the combustion chamber to improve combustion. I wouldn't call that a bad angle, but it does create header clearance issues. P's require specific headers. Non P's don't. Some full lengths will work on P heads without spark plug clearance issues. P's actually have slightly smaller exhaust valves and ports, but flow better because of better velocity.

What headers are compatible?

85_SS_302_Coupe · Mar 28, 2012

LilBerx said:
What headers are compatible?

Ford make some, Mac used to and i've heard that Mac full lengths will clear the plug because they come out from the head far enough but that's just what i've heard. I've also heard you can use certain spark plugs that are shorter along with 90 degree boots. I would opt for Ford Racing's headers if it were me.

darthcual · Mar 28, 2012

I made my bbk longtubes fit over my p heads. Not by beating on them but by using 90* spark plug boots on two of the plugs. The drivers side is the pita. P heads also have a smaller combustion chamber which bumps compression. They are the better head just harder to work with.

VibrantRedGT · Mar 28, 2012

I agree, you won't feel the difference between the two. If I had to pick I'd own GT40's because I can use just about any header. I'd probably send them out to a machine shop for some work too.

NIKwoaC · Mar 28, 2012

stykthyn said:
Dollars to donuts your butt synopsis won't tell the difference between the two.

Agreed. It's kind of like the argument between the Cobra and the Explorer intakes... You can spend all day analyzing the difference, but in the end it's a moot point because they're pretty much the same thing and neither one is going to light the world on fire. While you're sweating out the differences, someone else bought a set of aluminum heads and made more power.

C6AE · Mar 28, 2012

What headers are compatible?

Summit has a brand that fits, I had them on my P's. Only changed to FR's because I found a used set of ceramic coated ones for cheep beans

85_SS_302_Coupe · Mar 28, 2012

According to an article a read, Robin Lawrence says the '96 GT40s in particular flow the best of all of them. He didn't go into why, but he was running deep in the 11s on them so he knows something.

srtthis · Mar 28, 2012

damn i aint hear uncle robins name is a long time!

GT-40P's VS GT-40's?

LilBerx

Active Member

srtthis

the guy doing it does every local racers rear end

85_SS_302_Coupe

it sucks (I know) to be on the receiving end

stykthyn

I want to measure mine. It doesn't look that tall.

Boosted92LX

It's only an inch or two. What's the big deal?

LilBerx

Active Member

85_SS_302_Coupe

it sucks (I know) to be on the receiving end

darthcual

Member

VibrantRedGT

"STANGNET'S PENGUIN SMACKER"

NIKwoaC

中國製造

C6AE

Member

85_SS_302_Coupe

it sucks (I know) to be on the receiving end

srtthis

the guy doing it does every local racers rear end

Similar threads

GT-40P's VS GT-40's?

Active Member

the guy doing it does every local racers rear end

it sucks (I know) to be on the receiving end

I want to measure mine. It doesn't look that tall.

It's only an inch or two. What's the big deal?

Active Member

it sucks (I know) to be on the receiving end

Member

"STANGNET'S PENGUIN SMACKER"

中國製造

Member

it sucks (I know) to be on the receiving end

the guy doing it does every local racers rear end

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