327 serious problem

[rszmjt]

Did the shop who machined it put in a exchange crankshaft? It’s either cracked or the bob weight figure is way off. Was it balanced? I had a shop screw up the bob weight calculation 1 time by figuring in 2 small end connecting rod weights. I would also make sure the flywheel & balancer is a non counter weighted style.

[RALLY]

Originally Posted by rszmjt

Did the shop who machined it put in a exchange crankshaft? It’s either cracked or the bob weight figure is way off. Was it balanced? I had a shop screw up the bob weight calculation 1 time by figuring in 2 small end connecting rod weights. I would also make sure the flywheel & balancer is a non counter weighted style.

Agree i mentioned balance too. This engine just seems like a real mess. Maybe a
wrong rod, crank is bad, on and on. I mentioned do a complete visual inspection on the bottom end. And also mentioned a complete balance job on the crank, rods, etc. Vibration means something is totally wrong with the rotating mass.