Best gasket to use
Safety Car
Joined: Sep 2007
Posts: 3,816
Likes: 16
From: Anchorage Alaska
St. Jude Donor '08-'09-'10
I just installed my headers last week (LGM as well, on a 2003 Z) and I used the F-body gaskets, GM part no. 12558573. I've read in numerous places that they are better than the stock gaskets because the exhaust ports are fully round rather than oval-shaped. I'm guessing it helps the exhaust flow better. If I recall, I think that was even the recommendation from LGM when I ordered my headers.
I bought them for $10 each from Fichtner Chevrolet (forum vendor). Be careful though, you'd think something like gaskets come priced per pair but these don't! I almost ended up with only one gasket.
btw... in case you don't have a good set of instructions for the header install... I found these very useful.
http://www.cajundude.com/longtubes.htm
edit: Here's a pic of the F-body gaskets vs. the stockers (from Cajundude's instructions above)
I bought them for $10 each from Fichtner Chevrolet (forum vendor). Be careful though, you'd think something like gaskets come priced per pair but these don't! I almost ended up with only one gasket.
btw... in case you don't have a good set of instructions for the header install... I found these very useful.
http://www.cajundude.com/longtubes.htm
edit: Here's a pic of the F-body gaskets vs. the stockers (from Cajundude's instructions above)
Last edited by Alaskanpilot; Dec 29, 2009 at 06:55 PM.
Safety Car
Joined: Jul 2005
Posts: 3,572
Likes: 9
From: Jackson Tn
St. Jude Donor '06-'07-'08-'09
is GM P/N 12558573 the correct number for these gaskets?
looks like the new number is 12617944
where's the best place to purchase these?
looks like the new number is 12617944
where's the best place to purchase these?
Last edited by printmanjackson; Feb 22, 2010 at 11:48 PM.
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