This 2.8 liter racing engine has several goodies; An early 911 sand-cast aluminum crankcase, bored for 92mm P/C, a 66mm Carrera 6 crankshaf, early aluminum centerlube cam housings, 906 centerlube camshafts, the early twin-plug Marelli (27mm) distributor, a racing oil-filter housing including the Porsche original natural fiberglass engine covers.