Removed my flywheel to resurface it. When cleaning off the grime, I notice what appears to be broken bolts in two of the unused holes on the perimeter (see attached photos). They are near the balancing marks on the backside. Would anyone know if this was part of the original balancing procedure, maybe a repair from overdrilling, or the previous owner mistakenly trying to use those holes to reinstall the cover assembly?

Do I remove the broken bolts, or leave them in?

Also, does the flywheel need to be rebalanced after resurfacing? If so, is this typically done by the same folks who resurface it?

Thanks!

Personally I'd leave them alone if they were in there before you removed the flywheel, let sleeping dogs lie sort of speak. They are not in the 6 bolt holes that are part of the pressure plate pattern and if you didnt have balance issues before dont sweat it. As far as the resurface no you do not need to re-balance your flywheel after a resurface. However if you want absolute piece of mind you could balance the flywheel and pressure plate as one assembly and then index it when their together so when you re-assemble you can line up the index marks like it was on the balancer.

I assume you meant with the clutch plate sandwiched between them too? And is this a common or uncommon procedure? Wouldn't mind doing that, but outcome probably has a lot to do with the competence of the person doing it?

I'm guessing one way to find out if the broken off bolts belong is to see how the flywheel balances as is. If out of whack, then I'd say the bolts come out.

Thanks!

Those are slugs that they put in at the factory to balance your fly wheel. Leave them alone or you will really have a vibrating issue.

I would agree, but is this your hunch, or do you know this as a fact?

This is fact bro go ahead and drill the out and tell me how that works out for you. LOL