GT40 Heads and Headers
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Senior User
Joined: Apr 2012
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From: Fort Worth, Texas
GT40 Heads and Headers
I have my motor and am almost ready to take it to the machine shop. I will be spending the rest of this week looking for a set of GT40 heads. Both questions referr to a 94 F150 that currently has a 300 6 and am building a 351 Windosr from a 95-96 F-250.
My first question involves the heads. I have read they came on 96 Ford Explorers and 96 Mercury Mountaineers. I am assuming this was on all the 302's? Was this the only head used in that year model? What and where is the casting number to look for?
I have been looking at long tube headers on line and see some with the EGR port. Will I pass emissions for the next few years without hooking up the Air Pump? If I weld ports into the headers for the Air pump, is it OK to put them in the rear most tube or does it need to be down by the collectors?
My first question involves the heads. I have read they came on 96 Ford Explorers and 96 Mercury Mountaineers. I am assuming this was on all the 302's? Was this the only head used in that year model? What and where is the casting number to look for?
I have been looking at long tube headers on line and see some with the EGR port. Will I pass emissions for the next few years without hooking up the Air Pump? If I weld ports into the headers for the Air pump, is it OK to put them in the rear most tube or does it need to be down by the collectors?
Postmaster
Joined: May 2008
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From: La Vergne, TN
96 explorers/mountaineers 5.0's had GT40 heads.. 97 and after 5.0's had GT40ps..
The regular 40's have 3 bars cast on the front of the wads.. The P's are 4 bar..
The P's require special headers cause a different plug angle.. But are better than standard 40's..
Gt40's also came on 93 mustang cobra's and 93-95 lightnings..
The regular 40's have 3 bars cast on the front of the wads.. The P's are 4 bar..
The P's require special headers cause a different plug angle.. But are better than standard 40's..
Gt40's also came on 93 mustang cobra's and 93-95 lightnings..
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Joined: Mar 2013
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I've use regular ceramic Ford racing headers on gtp heads and then on gt 40s and never had a problem Jus one spark plug curb on the header flange had to be modified so the sparkplug socket would fit.
The only headers that I wouldn't use are crappy m.a.c. same length headers no good Jus looks but crap
The only headers that I wouldn't use are crappy m.a.c. same length headers no good Jus looks but crap
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Joined: Jun 2006
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From: Ottawa, Ontario
The heads on all full size truck engines have ports in the heads, it's anybodys guess why Ford felt the need to design a different system for the HD truck. In general GT40 heads don't have these air ports but there were a some that did.
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I found some heads at the local JY. They turned out to be GT40P heads instead of the GT40's I was looking for. Everything I have read says headers are a pain on these heads for spark plug clearance and burning up wires. I am looking for Long Tube Ceramic coated headers with an EGR port and an O2 port. If I ABSOLUTELT HAVE TO I will weld in ports but would rather start with the right stuff.
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From: Fort Worth, Texas
OK so I found some long tube headers with the EGR port and the O2 sensor ports already in. My next question is do I get the ceramic coated or not? It is my understanding that the ceramic coating aids in heat distribution. Basically acting as a heat shield as opposed to putting heat shielding material around them.
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So son't buy them already coated buy the plain steel headers and fit them. I didn't even know you could get them coated locally. I'll have to look. I was talking coated from the manufacturer.
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