Pontiac Performer heads utilize a D-Port exhaust port configuration for standard D-port exhaust systems.
Designed for 1962-79 389, 400, 421, 455 cid V8 Pontiac engines with a bore of 4.060in.
or larger, they feature optimized oil return passages for increased oil flow.
Available in three heart-shaped combustion chamber sizes, including 65cc, 72cc, and 87cc, the 65cc combustion chambers are as-cast, while the 72cc and 87cc chambers are fully CNCd to provide a 9.5:1 compression ratio when used with flat-top pistons.
The spark plug has been relocated closer to the exhaust valve for improved performance.
Cast with extra thick port walls and a compact port size, these heads are ideal for CNC and hand parting.
Complete heads include guide plates, rocker studs, and high-quality valve train for direct bolt-on application.
The head crossover is machined for 50-state emissions legal performance.
