head gasket or ring?

the cap and radiator are new (as well as my entire cooling system save for the fan, mechanical fans dont really go bad)...

and yes that is exactly right stroker, ive never done them before nor would i know how to start...im under the impression you would have to pull the engine, and i dont really have that option.....

thats kinda what i was thinking about the oil though...i mean there was a very thin coat of oil not burt when i pulled it...i guess its possible i cought it on a down stroke before that oil had a chance to burn...but even if i got a pressure tester, wouldnt i also loose pressure if there was a hole in the head gasket?