Because the engine is such an integral part of the Boss 302 mystique, Parnelli's powerplant retains its stock stroke and high-rpm personality. In fact, G.S. Johnson built the engine with enough cam to give it a definite stutter in idle, something Parnelli approves of. Details include a 289 Hi-Po distributor with PerTronix innards, a three-angle valve job, and F.P.A. headers.