It was assembled with some oil but here is the deal. First assemble, with the gasket in, ran a tank, cool down, the compression @ 145psi. Disassembled and re-assemble without the gasket, same deal, ran a tank and cool down, 175psi. Sat for 2 days. I rechecked because was suspicious but same 175psi. So I thought the rings needed seating so I again reassemble with the gasket in now back to 145psi... The P&C is "C" assembly so the squish might be that far off with the gasket in. I checked the squish without the gasket and it came out .020" so I guess with the gasket about .039".
I'm trying to keep this one stock but I like having the extra compression without the gasket, I just might mod it.