Head includes Pontiac D-port exhaust and is for 1962-79 389, 400, 421, 428, and 455 with a 4.060" or larger bore. Heads listed have heart-shaped, fully-CNC-machined combustion chambers, extra-thick port walls for porting, and improved oil return passages. Assembled heads are fitted with stainless steel 2.11" intake and 1.66" exhaust valves, heavy-duty valve springs, steel retainers, keepers, valve seals, rocker studs, and guide plates. Sold individually.
- Cylinder Head Style:
- Bare
- Cylinder Head Material:
- Cast aluminum
- Cylinder Head Finish:
- Natural
- CNC-Machined Combustion Chamber:
- Yes
- Combustion Chamber Volume (cc):
- 87cc
- Combustion Chamber Style:
- Heart
- CNC-Machined Intake Runner:
- No
- Intake Runner Volume (cc):
- 204cc
- Intake Port Shape:
- Rectangular
- Intake Port Location:
- Standard
- Intake Valve Angle:
- 14 degree
- CNC-Machined Exhaust Runner:
- No
- Exhaust Runner Volume (cc):
- 145cc
- Exhaust Port Shape:
- D-port
- Exhaust Port Location:
- Standard
- Exhaust Valve Angle:
- 14 degree
- Intake Valves Included:
- No
- Intake Valve Diameter (in.):
- 2.110 in.
- Exhaust Valves Included:
- No
- Exhaust Valve Diameter (in.):
- 1.660 in.
- Valve Type:
- N/A
- Maximum Valve Lift (in.):
- N/A
- Valve Springs Included:
- No
- Valve Spring Type:
- N/A
- Outside Diameter of Outer Spring (in.):
- N/A
- Valve Guides Included:
- Yes
- Valve Guide Material:
- Manganese bronze
- Valve Seats Machined:
- No
- Valve Seat Material:
- Ductile iron
- Valve Seat Machine Style:
- 3-angle
- Retainers Included:
- No
- Retainer Material:
- N/A
- Valve Stem Seals Included:
- No
- Valve Stem Seal Style:
- N/A
- Locks Included:
- No
- Lock Style:
- N/A
- Camshaft Style:
- N/A
- Spark Plug Style:
- Angled
- Guideplates Included:
- No
- Guideplate Pushrod Size:
- N/A
- Rocker Arm Studs Included:
- No
- Rocker Arm Nut Thread Size:
- N/A
- Accessory Bolt Holes Drilled:
- Yes
- Valve Cover Mounting Style:
- Perimeter bolt
- Heat Crossover:
- Yes
- Steam Holes Drilled:
- No
- Oiling Style:
- Through pushrod
- Machined for O-Ring:
- No
- Quantity:
- Sold individually.
- CARB EO Number(s):
- D-215-94
- Emissions:
- California EO Approved
- Make:
- Pontiac
- Engine Family:
- Pontiac V8
- Engine Sizes:
- 5.7L/350-7.5L/455
- Years:
- 1959-1979
