I know this is not the engine forum, but ya'll seem to be very knowlegable in many areas. I have a ST GS 45 that is leaking compression where the head bolts to the case. I have tighten down the bolts, no luck. I have removed and try to reseat the head, no luck. Any Ideas out there.

sounds like the head is warped, or a burr on the head or cylinder. If you are really careful, you can use a very fine grit rubbing compound between the cylinder and head mating surface to make them fit again.

I dont know ? could you use that automotive gasket maker the blue stuff in a tube I have used it on cars seems like good stuff??
just an idea