with 5 bolts around each cylinder small block chevys are one of the easiest engines to seal, so use a steel shim gasket the factory used them for years in the sixties and seventies. I personally like the new graphite based gaskets but they are a mess to clean up when you pull a head.
Chevrolet has some steel shim type head gaskets that are only .026 thick compressed. About $10 each. Work great but have no holes for the 400SBC .......sorry pcesak
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