My motor has stock 882 heads and I have no clue on what pistons I have. The motor was supposedly bored .030 over but I have no actual proof. I'm guessing around 8.5:1 but would like to know for sure before I do any work to my Sportsman 2 heads which will be going on. Any help would be greatly appreciated.

first cc the head combustion chambers they may have been milled at some point piston to deck clerance with a dial indicator comp rsatio of piston with your head head gasket thickness . cc the heads first summit sells a cc.ing kit cheap