like everyone has said 53 12v motors are not herd of cracking. ive herd of 2 . 24v another story ive even parted a 98 12v truck that had 660k on the clock no crack and dowl pin had never moved. but anything can happen. seen several 600hp pullers that had 53 block and ran for several seasons no problems you just always hear about the bad ones not the good ones.