Edelbrock Performer Pontiac 389-455 (With D-Port Exhaust)

These heads use the popular Pontiac D-Port exhaust port exits for use with standard D-port aftermarket exhaust systems. Performer Pontiac heads are designed for 1962-79 389, 400, 421, 428 and 455 cid V8 Pontiac engines with a 4.060" or larger bore. Manufactured with optimized oil return passages for improved flow. These heads will accept factory pushrod guideplates (must split guideplate pairs), rocker studs and accessory bosses. The casting is manufactured from A356 aluminum and heat treated to T6 spec for superior quality. These heads are available in three dual quench combustion chamber sizes, including 65cc, 72cc, and 87cc; the 72cc combustion chambers 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. These heads are cast with extra thick port walls and a compact port size, making them ideal for CNC & hand porting. Heat crossover is machined for 50-state emissions legal performance.