Pontiac engine swap questions

[spyder4560]

I have a '69 3/4 ton GMC 2WD that the previous owner put a 400 Pontiac engine and 400 Turbo into.It has headers,which at this time are swiss cheese,and I was wondering if anyone knows what header might possibly fit this combo.Should I go with stock manifolds or try to find replacement headers.Need some ideas pretty quick,cause the local cops are starting to chisel away at my bank account!!!

[69 longhorn]

I cant say for sure on the Poncho, but I ran a set of A body(cutlass) headers on a 455 olds in my old truck, with a couple small trimmed spots on the frame. You might try a late 60's lemans/GTO header....best of luck,crazyAl

[C-10 simplex]

http://forums.performanceyears.com/f...d.php?t=596830

He doesn't say exactly in his writeup, but i'm ASSuming Summit headers for 2nd gen firebird. i know you should never ASSume anything, but what are you going to do? Actually, if you think about it, they, the firebird headers, should work.

[Captainfab]

You could also try contacting the forum member that started this thread. He may be able to tell you what will work.

http://www.67-72chevytrucks.com/vboa...d.php?t=427005

[vin63]

Originally Posted by spyder4560

I have a '69 3/4 ton GMC 2WD that the previous owner put a 400 Pontiac engine and 400 Turbo into.It has headers,which at this time are swiss cheese,and I was wondering if anyone knows what header might possibly fit this combo.Should I go with stock manifolds or try to find replacement headers.Need some ideas pretty quick,cause the local cops are starting to chisel away at my bank account!!!

I went with a set of Hedman swept back shorty headers on my Pontiac since my '63 truck is pretty low and I wanted to run a 3-inch diameter exhaust on the outside of the frame rails, but you can run the exhaust on this inside of the frame rails just as easily with smaller exhaust tubing. I think uncoated, they are new for around $280.