Hey guys i have a question for ya..i bought a 535 trex engine with the crank blown...it seperated on the flywheel side from the web..i was told it was a 10 mm crank but not sure of the rods..crank has pc stamped on it.. which would make it a 120mm rod correct??the cylinders are 73mm..what crank should i buy???i have new pistons with new pins..can i measure them to know what size the rods are...they are correct for crank....if so what should it measure???