I lost a fresh 454 (30 over) once when a roller lifter broke. cracked the block in the cam tunnel....sucks. Mine the wheel was in two pieces and the link bar was broken and obviously the lifters went sideways destroying the cam....pumped all that crap through the bearings because I didn't have the bypass plugged....mine was a 512 casting 1970 block. What a waste. Still have it but afraid to use it...was told I could do a partial fill to keep crack from leaking but never did.