I have a 2bolt main 350ci motor that originally came out of a 71 impala.i had canada engines go thru it and put a fresh piston kit,280 comp cam,and oil pump.i drove it for about 1000km and then it started to knock.still ran fine so a few people said its probably just a spun bearing but i yanked it out and didnt touch it.no heads or intake.$230 call text or email