The flywheel bolt holes go all the way through the flange, and are exposed to crankcase oil. It's possible for the oil to follow the threads and leak into the bellhousing, especially if a split-type lockwasher is used. I prefer the star type washers, with the teeth pointing inward. Thyey do a pretty good job of sealing oil, even if sealer isn't used. The flywheel bolts are 7/16-20 thread.

www.ebay.com/itm/265701064242?

Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!