4th gen headers fit on a 3rd gen???
Thread Starter
Senior Member

Joined: Jun 2001
Posts: 920
Likes: 0
From: Saskatchewan
Car: 1986 Iroc
Engine: 454 Demon 850DP
Transmission: TH350, 3500 stall
Axle/Gears: 3.73
4th gen headers fit on a 3rd gen???
The heads I am using on my 86 Iroc are supposed to match up with the exhaust ports on LS1 headers better than 3rd gen ones. Does anyone know if they will fit?
If your talking LS1 no they won't , the LS1 exhaust port location is like a big block or small f***. It's the "D" shape. You'll need to search for headers w/ "D" shaped head pipe. If no such thing, I guess you could match the head to a set of retangle port headers..I wouldn't go to far up into the port though (less than1/4") shouldn't need much. Or find some old headers w/ the "D", weld cut and weld.
Just trying to help.
Just trying to help.
Thread Starter
Senior Member

Joined: Jun 2001
Posts: 920
Likes: 0
From: Saskatchewan
Car: 1986 Iroc
Engine: 454 Demon 850DP
Transmission: TH350, 3500 stall
Axle/Gears: 3.73
Thanks for the help guys. I think I will just try to port my existing headers as close as I can get to matching the heads.
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