Originally Posted by Frank_Jaeger

http://ls1tech.com/forums/conversion...ce-inside.html



Check if the pistons are loose on the rods or if the rods are loose on the crank. There shouldn't be play up and down or side to side. Then check all the bearings. It'll be obvious which one failed if it was rod or pin knock. If you don't find anything, I'd spec it out to be sure.