Abstract: A valve cover assembly for use on an internal combustion engine includes an adapter ring structured and disposed for mating and sealing attachment to the engine block in surrounding relation to cylinder openings, a removable cover which sealingly engages with the adapter ring in order to enclose the cylinders and valves of the engine, an O-ring seal for sealing the cover and the adapter ring when in assembly, and a quick release mechanism to releasably connect the cover to the adapter ring and allowing for quick removal of the cover in order to gain access to the engine interior without the need of first removing associated engine parts.