They're closed today, else i'd call them. I'm wondering if the I should put gasket sealer between the copper 2bbl adapter and the head or just between the header and the adapter. Both makes sense to me, but I'm not the most sensible. Anyone know?

 

mainly should be concerned with head to gskt would be my biggest concern. header should be pretty flat and seal. i know the port is wider and bigger and maybe a little mismatch. common sense situation make a call. overkill is never a bad thing.