[bry593]

I'd measure both sides to determine the difference. I bet that broken spring was on the shim. Probably found to be weak during the rebuild and they cheaped out and did not replace the set. Sure doesn't build confidence seeing two different machine works and seal styles.

Yes, the vac gauge will jump around if a cylinder has a valve that is leaking. You can't have vacuum or pressure if there is a leak....

Might also think about dropping a set of the Summit (Dart) iron heads on your motor. These are damn good for the money. Will bump your compression (72cc), flow well (2.02/1.60) and be solid castings (Dart USA). I use them and have 20k+ miles on one set without a single issue.