Related Photo Galleries
Given the use of the flat-tappet cam, Demon Engines highly recommends a quality motor oil (like Lucas or Royal Purple) and use of its high-zinc break-in additive. We followed the break-in procedure recommended by Demon for this test motor, which included use of the high-zinc additive from Lucas Oil and prelubing the motor prior to start (to ensure oil was supplied to every rocker arm). Before assembly, the cam lobes and each lifter were liberally coated with moly-based assembly lube. Using this procedure, Demon has never experienced a cam or lifter failure with a flat-tappet cam.