For some time, I have been ill. I have healed. I have dual MC Chevy V8s that are antifreeze cooled, except risers and heat exchangers. Salt water passes through risers to cool exhaust, but not exhaust manifold. I ordered riser SS spacers and gaskets from Sierra and will be install them soon. My exhaust manifolds are NOT blocked off where they meet risers (old model); hence I must use the SS spacer. My gaskets didn't come with instructions to use additional sealant between gasket and ss spacer/manifolds and riser surfaces. Should I use a sealant or sandwich the gaskets on or install them DRY? Please advise. THANKS
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