340 Static Compression Numbers and Test Procedure

How did you determine this? With a piston stop and degree wheel? That is the only way to know for sure.
If the balancer is old it could have slipped as YR stated. Mine is off about 3 degrees and waiting for replacement. I was chasing my tail on tune and timing and while the 3 degrees wasn't enough to kill me, it wasn't helping.
Right mine is way way off like 50 degrees. A piston stop method with a degree wheel takes me right to the point of yanking the dam thing and tearing it down and putting a new known cam in and lower comp pistons..........I think I am almost at this point then.....