The Edelbrock #61569 Performer Pontiac Bare Cylinder Head utilizes 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
Product Features:- Bare Single For Hydraulic Roller
- 87cc Combustion Chamber Volume
- 204cc Intake/145cc Exhaust Runner Volume
- 2.11 in. Intake/1.66 in. Exhaust Valve Diameter
- 0.625 in. Deck Thickness