header won't seal up

customcab66 · #1 (**permalink**) 10-28-2009, 09:13 PM

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

MeanGene427 · #2 (**permalink**) 10-28-2009, 09:55 PM

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

customcab66 · #3 (**permalink**) 10-29-2009, 12:13 PM

ok will have to try that as soon as i can get home

Krewat · #4 (**permalink**) 10-29-2009, 05:32 PM

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.