Head Gasket For Aluminum Heads

[69 R/T]

I have Federal-Mogul 350NP flat top pistons which are claimed to be about 9.3-1 with 78cc heads. What's the best and thinnest gasket that's aluminum head compatible to keep my compression at the highest point I can achieve with those pistons? Thanks!

 

[69Bee]

Cometic would be the best, and they can make gaskets from 0.027" all the way up to 0.140". This is the best way to dial in your compression ratio, and they are aluminum friendly. If you go with high performance Fel-Pro, make sure the fire ring is a pre-flattened steel wire for minimal brinelling of the head, but they only have 0.039" and 0.051" thicknesses.