looks like i blew a head gasket, im looking to go to a big bore and possibly 14:1 cp piston. what is the deal with the o-ring groove cylinders and heads, are the cylinder works ones at tqs already grooved and come with the mating gasket?? is it worth it? pics would be appreciated. also if anybody has what i want laying around in very good shape/bolt on, shoot me a pm. Thanks.