Edelbrock Cylinder Head, 61579, Pontiac Performer D-Port, 87cc, Flat Tappet Cam

The Edelbrock #61579 Performer Pontiac Cylinder Head utilize a D-Port exhaust port configuration for use with standard D-port exhaust systems. They are designed for 1962-79 389, 400, 421, 428 and 455 c.i.d. V8 Pontiac engines with a 4.060" or larger bore. They feature optimized oil return passages for increased oil flow. The spark plug has been relocated closer to the exhaust valve for improved performance. This head is cast with extra thick port walls and a compact port size, making them ideal for CNC and hand porting. Complete cylinder head includes guide plates, rocker studs and high quality valvetrain for direct bolt-on application. Heat crossover is machined for 50-state emissions legal performance.

PERFORMER D-PORT

Performer Pontiac heads utilize a standard D-port exhaust port

Designed for 1962-79 389/400/421/428/455 c.i. V8 Pontiac engines with a 4.060" or larger bore

Optimized oil return passages increase oil flow

72 & 87 cc chambers fully CNC’d to provide a 9.5:1 compression ratio using flat-top pistons

Spark plug relocated closer to exhaust valve for improved performance

Cast with extra-thick port walls & compact port size are ideal for CNC & hand porting

350 c.i. engines may require notching the block for valve clearance

Three head bolt bosses raised higher than standard D-port heights & require head bolt kit #85612

Deck thickness: 5/8", rocker stud diameter: 7/16", pushrod diameter: 5/16" (width of slot in guide-plate)

Must be used on vehicles without secondary air injection to be emissions legal, E.O. D-215-94