The PO was pulling everyones leg all those years. He claimed 836, 900 and sometimes 936. Well I should have guessed, I took the head off to determine the bore size for the new head gasket, it appears to be stone stock. I need to dig out the old speedo to remember the miles, don't think it was too many, seems like under 20K.
It's not the # correct engine for this K0 either but I don't have that one anyway.
Now the decision is, put it back stock? It seems to run well. Or, I have an 812 engine apart, it was run with a plugged exhaust and is dripping with carbon black, I could maybe if they check out, snag the cylinder and pistons from it, get some rings and gaskets and a hone job. The other choice is a new forged piston 836 kit, but that will kill off the chance of a professional candy paint job $$$$ budget wise.
I've just never been the leave it stock kind of a guy.