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Hello !
I am gonna put a 390 gt engine in a f150 1976 modell
I have original manifolds but i want to buy some headers.
The 390 gt engine have a 14 bolts pattern (not very common)
Will mustang headers fit the truck or do i have to buy truck headers.
If the mustang headers don,t fit, what kind of headers will fit ?
You almost always have to buy the headers for the specific chassis you're putting them in. That, or be prepared to do some modifications of your own to make them fit.
Heck, even some dedicated headers are hard to fit!
What's different about those heads from any other FE head? And are you saying they were found in the Mustang GT (or perhaps other GT models) only?
I'm not an FE expert by any means, so I had never heard mention of them.
Hopefully someone has tried non-truck headers in their '73-'79 models, whether FE or Windsor or 335.
Good luck!
The 390GT was only a one or two year engine. 67 or there about. I don't think you can even find headers with the GT bolt pattern anymore. Can you even find exhaust manifold gaskets?
The 390GT was only a one or two year engine. 67 or there about. I don't think you can even find headers with the GT bolt pattern anymore. Can you even find exhaust manifold gaskets?
Yes JBA have headers who fits 390 gt and yes i have bought manifold gaskets
You almost always have to buy the headers for the specific chassis you're putting them in. That, or be prepared to do some modifications of your own to make them fit.
Heck, even some dedicated headers are hard to fit!
What's different about those heads from any other FE head? And are you saying they were found in the Mustang GT (or perhaps other GT models) only?
I'm not an FE expert by any means, so I had never heard mention of them.
Hopefully someone has tried non-truck headers in their '73-'79 models, whether FE or Windsor or 335.
Good luck!
Paul
Yes the bolt pattern is different from ordinary fe engine and the gt engine have a 428 camshaft.
had been nice to get a answer from a guy who have tried a non truck headers in a f150
You should be able to use and standard 8 bolt FE header on a GT head, I'm sure this is true of a 428 CJ head because I did standard 8 bolt the crossover headers on my high boy . I just used the standard top and bottom holes and ignored the other 8.
I assume the GT head is the same situation but confirm it before you order anything.
Use Remflex gaskets unless you enjoy changing header gaskets often.
"The 390 GT heads have a unique 14-bolt pattern, with upper holes all across, lower holes only on the front and rear ports, and the side-by-side holes as found on the CJ heads. The upper holes on the 390 GT heads are not in the same position as on other FE heads either—making proper header fit a challenge."
So 440, I think the headers worked for you on the CJ because they have the 16 bolt pattern and the upper and lower holes line up, but a GT head has the 14 bolt pattern and the upper and lower holes won't line up. He'd end up with the middle two exhaust ports with no lower bolt and the rear bolt holes wouldn't line up.
A member on a mustang forum said this... "You're not going to find much in the way of headers that fit the 14 hole bolt pattern. AFAIK the FPA headers are your only option. All other FE headers are going to be designed for the 16 hole CJ bolt pattern or the 8 hole passenger car bolt pattern. The 14 hole pattern is very similar to these patterns but IIRC the rear bolt holes are in a different location and must be plugged and redrilled to get "standard" headers to fit."
OP do you have a pic of the exhaust side of your heads with the manifold on it?
Looking around, the ONLY headers I can find to fit a 390GT head in a Mustang (without modification to the head) are the FPA Tri-Y headers. I don't see any way these are going to fit in the truck unless you cut them apart. Maybe FPA will sell you the flange and you can make something of your own with another set?
here are the Hooker long tube headers I have in my F100 with a 390 for comparison. I think the GT headers above would probably end in the firewall. That said I'd give the FPA people a call and see what they think.
I run 390's in two of my trucks. 2x4 and 4x4. Personally for what you will spend "fitting" headers you would be better off selling those GT heads to a stock resto collector ( 68 mustang / 68 cougar ) those where made to fit in between the shock towers, other than that they are not as big a deal as the name suggests.Using Edlebrock heads ( They will flow better) and Headman ceramic coated headers for your 76. JMO
I run 390's in two of my trucks. 2x4 and 4x4. Personally for what you will spend "fitting" headers you would be better off selling those GT heads to a stock resto collector ( 68 mustang / 68 cougar ) those where made to fit in between the shock towers, other than that they are not as big a deal as the name suggests.Using Edlebrock heads ( They will flow better) and Headman ceramic coated headers for your 76. JMO
Interesting . but Ford isn't the only one to pull dumb stunts like this . that's why you never say never.
Actually it's a blessing. why have headers anyway, every time I do it I swear I'll never put headers on anything again. they're way more of a PITA than they're worth.
Looking around, the ONLY headers I can find to fit a 390GT head in a Mustang (without modification to the head) are the FPA Tri-Y headers. I don't see any way these are going to fit in the truck unless you cut them apart. Maybe FPA will sell you the flange and you can make something of your own with another set?
here are the Hooker long tube headers I have in my F100 with a 390 for comparison. I think the GT headers above would probably end in the firewall. That said I'd give the FPA people a call and see what they think.
Thank you for good help.
I have sent mail to FPA but only get answer that they don,t make headers for truck anymore.
I have original manifold so i probably just have to juse them (easy and cheeper )
I run 390's in two of my trucks. 2x4 and 4x4. Personally for what you will spend "fitting" headers you would be better off selling those GT heads to a stock resto collector ( 68 mustang / 68 cougar ) those where made to fit in between the shock towers, other than that they are not as big a deal as the name suggests.Using Edlebrock heads ( They will flow better) and Headman ceramic coated headers for your 76. JMO
I have bought this engine so i have to use it
Not very easy to get used 390 engines in Norway
I have original 1 360 engine in the truck but the engine have a crack in the block
You should be able to use and standard 8 bolt FE header on a GT head, I'm sure this is true of a 428 CJ head because I did standard 8 bolt the crossover headers on my high boy . I just used the standard top and bottom holes and ignored the other 8.
I assume the GT head is the same situation but confirm it before you order anything.
Use Remflex gaskets unless you enjoy changing header gaskets often.
I don,t think so because the top bolt holes in each side is higher than the boltholes in the middle on GT head
Interesting . but Ford isn't the only one to pull dumb stunts like this . that's why you never say never.
Actually it's a blessing. why have headers anyway, every time I do it I swear I'll never put headers on anything again. they're way more of a PITA than they're worth.
I have original manifold so i think a just have to use them, easy and cheaper
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