Originally Posted by Mrgoodwrench3
The parts can be purchased separately at gmpartsdirect.com
LS7 lifters 12499225
Lifter trays 12595365
Valley cover 12570471
I would recommend ARP head bolts. 134-3610 best price on ebay. I paid $91.00
The GEN4 5.3 has the larger 90mm 4 bolt throttle body.
link for arp bolts for $91.00 . . . pls''
and the TB is actually 87MM.