GTB

dwag · Nov 14, 2023

Got head gakts kit for GTB, fire rings are not a complete circle but have an indentation. Fel-Pro #7550B1 which when looking up on Fel-Pro web site shows this gasket. WTH?

Duey C · Nov 14, 2023

The guys should be along to help.
Notes about the older brother to your GTB's gaskets and my small sampling.
Some brand head gaskets don't have a perfect circle fire ring. Older MM USA GE29C head gaskets have the indented fire ring with the round portion at 4-15/16 diameter.
I don't know at this time who made gaskets for TC/MM, no maker's mark.
I thought the new FelPro 7550 gaskets I put in a couple years ago in the 413 (bored out 403) also have the indentation, didn't think twice as the older ones are the same.

Some gaskets do have a round fire ring like NOS Fitzgerald 728's. They have the same outside diameter.

This post was edited by Duey C on 11/17/2023 at 09:29 pm.

DPittman · Nov 17, 2023

The gaskets I used had that indentation which bothered me too. Called my supplier and was assured those were the correct gaskets. That said the first set of gaskets I used failed wound up with water in the oil so I used NOS gaskets after I tore it apart again and theyre still good. Dont know who made the first set but it might have been something I done wrong putting it together. This is a 403 also with LP heads.

GTB

dwag

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Duey C

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DPittman

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