gt40p heads | Ford Explorer Forums - Serious Explorations

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gt40p heads

BOTCHO

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October 26, 2022
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City, State
Aylmer Ontario
Year, Model & Trim Level
1948 ford panel truck F47
hello to all --Butch here from London ont I am presently working on a 47 ford panel van with a 5 litre 302.I am about to do a head swap from stock heads to gt40-p. I am having a bit of a hard time locating a shorty header or maybe use the 96 exh manifolds any one got a set to sell thanks in advance 226 998 4565

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Welcome to the forum. That engine swap is an unknown to most people you will connect with, the engine bay size, the frame rail space for headers, is unknown to me.

That being said, the OEM Explorer 302 headers are terrible, horrendous is a most accurate description. Try hard to avoid those, only use them if you cannot find a better choice. For non Explorers, most other headers made for "P" heads will fit your truck. That's a guess, the 2nd gen(98-01) Explorers have major space issues requiring those odd stock manifolds.

You might do well to search for other swap examples, of similar old Ford trucks. There have been a handful of threads here about old F100's(50's models) etc. Most P headers you find mentioned for those kinds of swaps would be good possibilities for your truck. Also many people have been able to use some normal 302 headers on the P heads. Those 1997 1/2 to 2001 Explorer heads have the plugs coming out at a slightly different angle, so the plug wires are moved closer the manifolds of normal models. So various headers have the pipes located a little closer or farther away from the plugs, thus some may work while most won't.
 






Beautiful car.
 






Welcome to the forum. That engine swap is an unknown to most people you will connect with, the engine bay size, the frame rail space for headers, is unknown to me.

That being said, the OEM Explorer 302 headers are terrible, horrendous is a most accurate description. Try hard to avoid those, only use them if you cannot find a better choice. For non Explorers, most other headers made for "P" heads will fit your truck. That's a guess, the 2nd gen(98-01) Explorers have major space issues requiring those odd stock manifolds.

You might do well to search for other swap examples, of similar old Ford trucks. There have been a handful of threads here about old F100's(50's models) etc. Most P headers you find mentioned for those kinds of swaps would be good possibilities for your truck. Also many people have been able to use some normal 302 headers on the P heads. Those 1997 1/2 to 2001 Explorer heads have the plugs coming out at a slightly different angle, so the plug wires are moved closer the manifolds of normal models. So various headers have the pipes located a little closer or farther away from the plugs, thus some may work while most won't.
wish the stang headers worked on these :( iirc ive heard of the TMH fitting swap ones, and iirc they make swap headers, but dont quote me.
 






V8 swap headers for 83-97 ranger would probably work. A few companies make them like Hedman and pacesetter.
 






There are a ton of headers that will bolt onto the P heads, they all fit that are made for the stock port bolt pattern heads. But the plug angles are much different in the P heads. The ports are identical in all OEM small block Ford Windsor heads(intake and exhaust), other than minor size changes. The bolt patterns are all identical, thus all headers made for one will fit all of them.

But the plugs coming out of the P heads are at a different angle, they place the plug wires very close to the headers that are made for the non P heads. So every one of those headers is a "test to fit" question, some will work fine, others not at all. None of the TMH headers were made well to give much plug wire clearance, so those are all very tight for all wires.
 






You can check out the Torque Monster headers see if there size fits, call the guy and talk to him nice guy.
 






Id avoid P heads and go with regular gt40s. Close to the same power and they will use your existing headers
 






GT40P heads are identical to GT40 heads except for the plug angle, and a slightly smaller chamber. The ports are identical. The slightly smaller chambers is worth about 0.2:1 of extra compression, not worth wasting extra money or time dealing with special "P" headers just to be able to use the P heads.
 






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