Thread: Anyone have a good Header gasket recommendation for the FE390? Mine keep failing

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Originally Posted by Rrumbler

Percy's 66053 Seal4Good Gasket - Performance Parts

I have heard a lot of folks swear these are good.

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While I have not used these, the soft aluminum sounds like a good idea. I never use gaskets with stock manifolds as they are machined to a near perfect surface and torqued as an assembly to the heads before the engine goes in the car. After years of having non-metallic gaskets fail (as you have described) I always use copper gaskets with headers. I also use Stage 8 stainless locking bolts. I know they're expensive but the combination of the copper gaskets and the Stage 8 bolts sure works well and I have never had a problem with gasket failure of loose bolts (which can lead to the gasket failure).

My 2 cents..
GS