Had a 340 motor built by a motor builder. fired the motor and had liftetrs not pumping up.great oil pressure oil on rocker arms. So he bought comp cam lifters, installed all new lifters. took care of a few on the drivers side.pass side still had problems. so he bought a box of crane cams lifters. #2intake and exhaust and #6 intake wont pump up. changed again with 3 new more lifter and still wont pump up.now he wants to install a solid lifter cam. whats going on ??