Edelbrock 61599 Performer Series D-Port Cylinder Head. Performer Series D-Port Cylinder Head. Performer Series D-Port Cylinder Head; Complete; 400-500hp; Chamber Vol. 87cc; Designed For 1962-79 Pontiac 389/400/421/428/455 V8 w/4.060in. Or Larger Bore; Single. WARNING CA Proposition 65 Message: WARNING: This product can expose you to Lead; which is known to the State of California to cause cancer or birth defects or other reproductive harm. Manufactured w/Optimized Oil Return Passages. Will Accept Factory Pushrod Guide Plates. Rocker Studs And Accessory Bosses. 50-State Emissions Legal Performance. Optimum Spark Plug Location Reduces Heat Loss. Machined And Assembled In The U. The Edelbrock #61599 Performer Pontiac Cylinder Head utilize a D-Port exhaust port configuration…