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Originally Posted by JET
Yeah, but the crank isn't even supposed to touch the bearing! As far as the bearings are concerned, the crank could be aluminum and be fine.
So how is the crank touching the bearing? There could be a lack of oil (or too much pressure breaking through the oil layer) or either the crank or bearing are getting out of position.
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I would bet the 2900lb pressure plate pressing against the crank doesn't help. The oil layer in there is very thin, and can be seperated very easily. The point of nitrating the crank was to help prevent further wear once contact is made, but then the bearings die...
I say nerts to 7 bolts entirely, its like trying to make a ford fiesta fast, sure it can be done, sure it can be done for cheap, but why bother when there are better options?
Chris C's motor had alot $$ into the machine work (I won't disclose the amount, thats his decision). Everything was done to the block except maybe machine the block to retrofit thrust washers like the 6g72 and most honda motors... There was nothing conceiveable left to try to make it 'crankwalk proof' except switch the clutch out and give the crank a fighting chance.
I am sure it will still walk, its a 7 bolt, just hopefully at a slower pace. But thats just my $.02.