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Auto Parts and Repairs
GM and GMC

How do you fix leaky header gaskets on a 1991 350 gmc pick-up nothing seems to help?


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Wiki User
February 20, 2014 11:04PM

best way to fix that is to use 2 gaskets

apparently one is not sealing ,probably because headers are slightly bent

you could also have headers machined

try using the factory style gaskets. Fel Pro is better. and turn them backwards so the metal side is on the head.

The copper or aluminum reusable gaskets also work well.