header won't seal up
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Elder User
Joined: Jan 2006
Posts: 861
Likes: 1
header won't seal up
i bought a set of headers at the local swap meet two years ago for my 390 worked great at the start now i can not get them to seal up at the heads they leak on all the tubes triied cutting the flanges and that only fixed a couple places any other suggestions
Tuned
Joined: Mar 2009
Posts: 360
Likes: 3
From: Napa
Unfortunately, as you're finding, not all FE heads have the exhaust (or intake) ports in the same place- some exhausts are high, some are low- seems like you have a mismatch between your heads and headers. If you pull out your gaskets, you'll probably be able to see a mismatch in the imprinted pattern in the gaskets 
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
The stock gaskets are much larger than the ports, and won't match the headers. I had the same problem with stock gaskets. Needed to use the 330 gaskets in the same head set, and open up the holes.
