Megablock, cast 1998?, bushed lifter bores, .060 hole drilled in bushing into the oil galley, Jesel rockers, Mike Jones inverted flank roller, .867 lift, supposed to be easy on parts due to very long lash ramps. Springs are PAC 1228 in at 2.035, advertised numbers say about 320 on the seat, 825 open at net lift .