Right on... with hypers and SCAT rods I would expect it to balance out internally by removing material from the cast 360 crank. Perhaps to include boring out a bit on the inside of the journals. I have been meaning to try to figure this out.....
Have done 3 cast cranks...all took mallory metal to balance with light weight rods and pistons...340 will need the same with heavier pistons and especially stock rods..
