:1zhelp:so recently i picked up a 86.5 with 91 engine tranny and rear end. i drove it for a couple of days and i spun my rod bearings, i put new brearings in and checked the crank i started the car up and for about 20 mins then knocking again. i found water in my oil so i took off the head and am getting ready to put in a new head gasket. the pistons and head look fine. could the knocking be from head gasket?:1zhelp: