I would first start by determining the cause of the rod failure. If the rod shank ( beam ) didn't fracture and you found the rod bolt nuts in the pan, this means that the rod bolts were under torqued. If the rod bolt broke, very likely the bolts were over torqued. If the bearing spun ( seized on the crank journal ) and broke the shank, the most likely culprit is insufficient oil clearance or an out of round bearing saddle. If the crankshaft was reground and the rods were resized and you experienced a spun bearing, I would suggest you look for another machine shop on your next build.
At the present time, I don't have a 300 block.
Bookmarks