[Tyrone Biggums]

thats totaly different knock than what you would get from running a lower octane gas.....

to put it to you bluntly, if a lock washer got into your cylinder, your fked. but, this could be a sign, telling you that its time to do a rebuild. while its apart, you might aswell have them put in forged internals, pistons and a good set of rings. as far as boring out the block, im not sure, it might cost as much or more to do that than buying a new cylinder block.....