First engine build.

For the factory service manual, the end gap for the two top compression rings is .010" - .020"

The ring end gap for the two thin oil rings is: .015" -.055"


You should be fine.


Also, before you install the pistons, check each piston and ring to make sure that it will spin freely when turned by hand. Then make sure that the ring end gaps for the two compression rings is at least 90° apart, I like to twist them 180° myself.

Also do the same for the two thin oil rings. Make sure that the ring end gaps are a minimum of 90° apart before installing them.

Check all main bearing and rod bearing clearances with plastic gauge.

You have a great block there. The '71 vintage blocks are the best of the 360's.