Dave assembled the engine himself. The displacement is nearly stock, with a 0.020-inch overbore to arrive at 285 ci. A stock steel Cobra crank, Manley Pro Billet rods, and 14:1 Ross Racing pistons with Total Seal rings make up the reciprocating assembly. The heads are Cobra castings, extensively and carefully ported by Griggs to Stage 3 specs and fitted with large 37x32mm valves and 202-degree/0.490-inch-lift Griggs cams. These cam specs seem mild until you recall there are two intake valves per cylinder, and you understand Griggs uses nonstandard measuring techniques. Flow numbers are in the 300-cfm league, and low-lift flow is especially impressive. The lash adjusters, rocker arms, and spring retainers are all stock; the valvesprings are Griggs.