[apexit4]

EDIT - See post #22 for details of the engine swap.

Hello All,
I'm a first time poster on this forum and have a serious question to ask: Are the crankshaft main bearing bolts one-time use?

I ask because my mechanic and I recently noticed what can be described as a clunk when the engine was revved to about 3k rpm. We suspected the issue would be the connecting rod bearings, so we dropped the oil pan to replace them. What we found was that all the bearings had extremely minimal wear and that there was no way the sound was coming from the connecting rod bearings. After consulting with a few other tech's, we now suspect it might be the main bearings on the crankshaft. Before taking taking these apart, I wanted to know if the bolts that hold these bearings on are one-time use. If they are, then I want to order the bolts at the same time as the bearings. Any and all help would be greatly appreciated!