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Remflex vs copper exhaust gaskets [message #348245] Sat, 21 September 2019 10:03 Go to previous message
RF_Burns is currently offline  RF_Burns   Canada
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
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My driver's side exhaust manifold has a large crack so I am replacing it with a used but good condition cast iron manifold. It has a few small pit clusters that are not deep and appears to have been plained but never used after that.

Two questions:
I have a new set of DaveL copper gaskets and a new set of Remflex gaskets. I'm wondering which would be the best. I know if it did not have any pits I would use the copper gaskets, but I'm leery because of the pits. How much pitting can copper withstand? I would be installing them with some Permatex high temperature copper sealant for exhaust manifolds. My worry about the Remflex is the higher temperature the manifolds run at due to the poorer heat transfer compared to copper.

Second thing is the top center bolt for the manifold broke while trying to remove it. I read where some do not bother to install this bolt as it is recommended not to torque it. So do I just leave the broken stud there as a installation guild, or do I need to remove it and re-install a new one. They had been installed with never-seize, likely zinc based. I'll be using copper based this time.

Thoughts, ideas, experiences...?

Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

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