Originally Posted by stallen50

i personally dont use the breakin shim. But it will take alot of stress off you connecting rod if you use. these motors are tight and may take a lil while to get fired up. heat heat heat. if you have any problems or questions pm me and i can help you.

Originally Posted by stallen50

doesnt matter where you put the breakin shim as it is to add a lil head clearance to ease the tightest. they say to remove after about a gallon. good luck you will love the motor