hey guys, got alot of valvetrain noise alot of people tell me its normal but this is my first ls1 36k on 98 ss, and i didnt do the head work or cam myself the previous owner did. so im alittle paraniod. heads are fully ported, milled .020 224/224 563/563 cam with double springs factory rockers and 7.35 push rods.was wondering maybe bad lifter?