Gt40p headers
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Cross-Country
Joined: Jul 2019
Posts: 68
Likes: 0
Gt40p headers
So I got another build coming up. Just a basic one. And need to get some headers that will fit well with gt40p heads. What you all got? And pictures of the fit and how hard it is to change the plugs with those headers. Thanks in advance!
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
Old thread but it did have some good info on this topic: https://www.fullsizebronco.com/threa...at-work.66998/
Hard to say if any of the headers mentioned are still available.
Hard to say if any of the headers mentioned are still available.
Lead Driver
Joined: Sep 2002
Posts: 9,550
Likes: 2,034
From: North Texas
I wonder if GT40P Explorer headers would fit the frame rails of these trucks? Hell, if anyone even makes them anymore. Maybe check Stan's Headers too. Guess you could start with the OE manifolds from those P vehicles and try from there. I cannot imagine those manifolds flow worse than the OE 302/351 manifolds, but who knows.
Laughing Gas
Joined: Dec 2005
Posts: 904
Likes: 115
From: Laurel, MS
Folks in the classic Mustang community used to claim that 289 Hipo manifolds would work with GT40P heads with a little grinding.
They're still manifolds, but they're probably better than most manifolds...
https://store.cobranda.com/19mush289hie.html
They're still manifolds, but they're probably better than most manifolds...
https://store.cobranda.com/19mush289hie.html
Tuned
Joined: Jan 2006
Posts: 362
Likes: 78
Yit96,
I went with Sanderson Shorty Headers on my 77 302 Dent. Very well made and a good overall fit. However, I don't think they would fit your Y pipe. The Sanderson headers are made for a Mustang, but fit our trucks easily.
I did consider using the stock exhaust manifolds from the Explorer my heads came from. However, it looked to me like they might interfere with my clutch linkage, as they snake way down as they move rearward. These manifolds might work with an auto trans Dent.
I went with Sanderson Shorty Headers on my 77 302 Dent. Very well made and a good overall fit. However, I don't think they would fit your Y pipe. The Sanderson headers are made for a Mustang, but fit our trucks easily.
I did consider using the stock exhaust manifolds from the Explorer my heads came from. However, it looked to me like they might interfere with my clutch linkage, as they snake way down as they move rearward. These manifolds might work with an auto trans Dent.
Lead Driver
Joined: Sep 2002
Posts: 9,550
Likes: 2,034
From: North Texas
Phew, you would easily have $1000 into P heads and headers to fit. Hard pass on that for me.
I would scout around for those old aluminum GT40X FMS heads with pedestal mounts (if you are retaining that rocker style) or the old Edelbrock 1.9" intake units. Lighter, better chamber, and can use any header you really want. I even used Mustang Fox 5.0 ones on mine for a while, fit fine with my AOD and 2x4.
I would scout around for those old aluminum GT40X FMS heads with pedestal mounts (if you are retaining that rocker style) or the old Edelbrock 1.9" intake units. Lighter, better chamber, and can use any header you really want. I even used Mustang Fox 5.0 ones on mine for a while, fit fine with my AOD and 2x4.
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Fleet Mechanic
Joined: Aug 2015
Posts: 1,838
Likes: 364
From: Candy Mountain
I have a set of the FMS headers in storage I would part with, but cannot confirm or deny their fit with GT40P heads as I don't have any to test with.
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Cargo Master
Joined: Mar 2010
Posts: 3,339
Likes: 293
From: Laramie, WY
Easy solution is to not get P heads. The standard GT40 heads don't have the header fitment issue as they have the same plug angle as the E7 stock truck heads. I used P heads and can confirm they're kind of a pain. #7 plug is an adventure to change every time.
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