The Performer cylinder heads are patterned after the 1969-70 Ram Air IV (round exhaust port) Pontiac head for outstanding performance gains from 1962-79 389-455 engines. They feature a 72cc combustion chamber for high-compression engines, or an 87cc chamber designed to maximize performance while using low-octane fuel with a 9.5:1 compression ratio. Deck thickness 5/8", rocker studs 7/16", pushrods 5/16". 50-state emissions legal. Sold individually.
- Cylinder Head Style:
- Assembled
- Cylinder Head Material:
- Cast aluminum
- Cylinder Head Finish:
- Natural
- CNC-Machined Combustion Chamber:
- No
- Combustion Chamber Volume (cc):
- 87cc
- Combustion Chamber Style:
- N/A
- CNC-Machined Intake Runner:
- No
- Intake Runner Volume (cc):
- 215cc
- Intake Port Shape:
- Rectangular
- Intake Port Location:
- Standard
- Intake Valve Angle:
- 14 degree
- CNC-Machined Exhaust Runner:
- No
- Exhaust Runner Volume (cc):
- 175cc
- Exhaust Port Shape:
- D-port
- Exhaust Port Location:
- Standard
- Exhaust Valve Angle:
- 14 degree
- Intake Valves Included:
- Yes
- Intake Valve Diameter (in.):
- 2.110 in.
- Exhaust Valves Included:
- Yes
- Exhaust Valve Diameter (in.):
- 1.660 in.
- Valve Type:
- Stainless
- Maximum Valve Lift (in.):
- 0.575 in.
- Valve Springs Included:
- Yes
- Valve Spring Type:
- Single w/Damper
- Outside Diameter of Outer Spring (in.):
- 1.460 in.
- Valve Guides Included:
- Yes
- Valve Guide Material:
- Manganese bronze
- Valve Seats Machined:
- Yes
- Valve Seat Material:
- Ductile iron
- Valve Seat Machine Style:
- 3-angle
- Retainers Included:
- Yes
- Retainer Material:
- Steel
- Valve Stem Seals Included:
- Yes
- Valve Stem Seal Style:
- PTFE Positive stop
- Locks Included:
- Yes
- Lock Style:
- 7 degree
- Camshaft Style:
- Hydraulic flat tappet
- Spark Plug Style:
- Angled
- Guideplates Included:
- Yes
- Guideplate Pushrod Size:
- 5/16 in.
- Rocker Arm Studs Included:
- Yes
- Rocker Arm Nut Thread Size:
- 7/16-20 in.
- 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.
- Notes:
- These heads require Ram Air IV (round port) style exhaust manifolds or headers and Edelbrock head bolt kit 8549.
- CARB EO Number(s):
- D-215-94
- Emissions:
- California EO Approved
- Make:
- Pontiac
- Engine Family:
- Pontiac V8
- Engine Sizes:
- 6.4L/389-7.5L/455
- Years:
- 1959-1979
