When you make power, you make heat. Ten fins on each head and cylinder cool those parts well, but an overheated piston crown can still heat the fresh charge, forcing use of a lower compression ratio to avoid detonation. Best, therefore, to follow modern practice, with a low-friction, light “ashtray” piston cooled by oil jets, just as were the pistons that powered Lockheed’s Constellation airliner. Two thin, low-drag gas rings are backed by the three-piece oil ring that is best for air-cooled cylinders. These cast pistons are entirely modern—completely flat on top, short-skirted and with short, light wristpins. Powertrain design supervisor Dave Galsworthy noted that reciprocating weight “cascades” through an engine. A heavier piston and con-rod small-end require larger bearings with more friction. They need heavier crank counterweights and balancer.