they go on either way... the manifold and the block each have the same
temp. when they heat up.. the whold gasket was make out of sheets of
material, so they could be sandwiched together, but it does not matter
which side goes where....
I don't know if it makes it the right way to do it or not, but if you put
the metal side toward the heads it will be easier to remove the gasket
material the next time. It's generally easier to remove and carry the
manifolds into a warm, well lit workspace than the heads.
Sometimes applying to both sides of the gasket, Ultra copper high heat
silicone, then letting it set up for 5 to 10 minutes snugging, another
10 minutes and tighten (from inside bolts/studs out to help reduce
warping) will give a great seal. Re-tighten after heat cycle!
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