I sent my 312 crank to be reground, The block was zero decked, and when the crank came back, pistons 2 & 6 were up out of the hole about .006-.008 and 3 &7 were about .017-.019 out of the hole. The crank was ground .030 on the rod journals. We put the crank in a lathe and measured the height of the rod throws and found that 3 & 7 and 2 & 6 were higher than the others. Could too much have been cut from one side of the journal to cause this? Maybe the crank not fitted properly in the tool? Operator lost center while grinding?
Is the crank completely ruined, or could it be still be offset ground to make a stroker? Really hate to lose a 312 crank.
Butch LawsonManchester, TN