Reply to "Stroker engine vibration"

That could be my front counter balance. It was the big hole that concerned me since you can measure in thousands how much material was left.

I think my rear counter balance looks the same too.

Frankly with a steel crank it must me an SOB to drill those out even on a drill press and be accurate.

My thought on the vibration is also that in my experience, you need to be really out of balance to pick up a vibration. Theoretically there is exact factory balance on the flywheel and dampener but talk to your engine balancer about that.

The thing to do in this instance is to get a new steel flywheel, install it on the engine before you tear it apart and see if it fixes it.

Location dowels in the flywheel for the clutch will sure help the situation and the clutch cover and the flywheel should be indexed.

The problem with having the clutch balanced is that no one is going to want to take it apart to remove weight from it.

Most likely what will happen is that it will get balanced along with the assembly. I'm not sure how good an idea that is at this point? I have to think about that.

Aluminum flywheels regardless of how accurately they are balanced do not absorb engine vibrations well because of lack of mass.

In any event, re balancing the entire unit will fix it, but make sure you use factory balance on the flywheel and dampener.