Let me ask you guys.Alright I get my bottom end rebuilt,new everything ARP rodbolts,spoon ITR pistons. I break it in according to the Helms manual,change the oil every two weeks drive easy except when Im racin on the weekends.And with 4000 miles on the block it starts knockin this weekend. What Im wondering is what the hell could have caused this.Im thinking of rebuilding it again but I dont know if the shop I got it built at knows what the hell there doing.