383 SBC GM block My oil pressures when warm were 35 at idle and 70 at 3000rpm. I should add that engine was built by American Speed and has a Schumann BM55 hp oil pump. Engine had covered 4000 miles when a rocker from RPM fell apart. No damage apart from a bent valve.
I decided to replace some of the valve train with top quality parts so.
I replaced the roller cam with an identical one in billet steel from Comp. I fitted Comp endure-x lifters with pressure feed to the rollers. Comp pushrods and again comp shaft rockers. Also replaced timing gear and valve springs. At the same time I ditched my distributor for an EDIS system and put in a MSD oil pump drive.
Upon reassembly the engine runs great but I have a @15 psi pressure drop across the board 20 at idle and 55 at 3000rpm. Whilst these pressures are not something to worry about in themselves I would like to know what has caused them. I can only think that either the lifters and or the rockers are flowing more oil and that this has caused the drop. I would welcome any comments from you guys. same oil nothing else touched no restrictors in the lifter galleries.