Greetings, my name is Ken I own a 1987 Corvette 4+3 Coupe. The car has spent most of it's life in storage. I'm replacing rocker arms,valve springs,valve seals,valve hardware. Z28 springs with .060 shim on ex side. Seat pressure on both banks 100lbs-105lbs. Should say Comp Cams roller tip rockers. Could not find std replacement lifters. Purchased GM#12499225 LS7 lifters and have heard many stories and tales about preload. I used the Proform blue checker and adjustable pushrod (Com Cams) for valve stem center contact. I would like to order 1 set of pushrods and be finished ! I'm thinking .050 lifter preload after looking at lifter plunger travel,anyone used these before? Has anyone had to deal with the AC bracket torx bolt I think T45 just below the pulley? Plan on changing water pump & timing set. Look's like somebody had a try on the bolt in question. I really like driving the car and will more than likely own another one maybe a C5 and keep this one too. A mixture of decades of motorcycle drag racing, 4 cylinder engine building, high RPM 2 cam engines but never spent much time on a SBC. I'm looking for a reliable set up for my driver Vette. Thanks, Ken