I will disagree with ChetMan on that issue. It is true that the older Chev engines with babbitted rod bearings had a characteristic 'rod knock' that was often tolerated for a time, but even those could be tightened up to stop the knock. Those engines were just more tolerant of loosness in the rods- because of bearing thickness. With the insert bearings in the later engines, you don't have that tolerance. Tappet noise in the engines with solid lifters was often ignored- up to a point.
Harvester
