Mike, Arias/Shelby aluminum 427 w/ Edelbrock MR heads, Scat billet stroker, 496 cu. in., TWM injection, Jessel roller rockers, K-motion valve springs (250 lbs @ base), Manton 3/8 chrome moly HD pushrods, Manley SS valves, Cam Motion custom ground cam (lift int. .64302 ext. .63235), valve lash int .025 ext .025, Speedpro HP/HV blueprinted
oil pump, Isky Red Zone severe duty roller lifters. I use a pre-oiler prior to engine start to get
oil pressure to 60 lbs. Engine hasn't been over 6800 rpm (MSD rev limiter) not babied and not abused. As I said before many
oil and filter changes (10 in all) best oil. Set the valves 10 times in 3k miles. When I found excessive lash, took engine apart and found lifter problem. Seemed to happen all at once.