Cylinder Head Specifications:; Combustion chamber volume: 87cc; Intake runner volume: 215cc; Exhaust runner volume: 175cc; Intake valve diameter: 2.11"; Exhaust valve diameter: 1.66"; Valve stem diameter: 11/32"; Valve guides: Manganese bronze; Deck thickness: 5/8"; Valve spring diameter: 1.46"; Valve spring maximum lift: .575"; Rocker stud: 7/16"; Guideplate: Hardended steel; Pushrod diameter: 5/16"; Valve angle: 14°; Exhaust port location: Stock Ram Air IV; Spark plug fitment: 14mm x 3/4 reach, gasket seat. These cylinder heads are designed for outstanding performance gains in 1962-79 389-455 c.i.d. Pontiac engines. They are patterned after the 1969-70 Ram Air IV Pontiac cylinder head. Performer heads #60579/#60575 are 50-state emissions legal for 1965-79 vehicles. They feature 87cc combustion chambers designed to maximize performance while using less expensive, low-octane fuel with a streetable 9.5:1 compression ratio. Our Performer RPM heads with the 72cc combustion chamber are for higher compression engines. Performer RPM #60509 is semi-machined and must be finished by a professional cylinder head porter. They include valve guides and seats installed with no intake pushrod holes. Performer RPM #60587 is not port matched or bowl blended and is NHRA accepted for Stock & Super Stock. INSTALLATION NOTE: These heads require Ram Air IV (round port) style exhaust manifolds or headers and Edelbrock head bolt kit #8549. Deck thickness: 5/8", rocker stud diameter: 7/16", pushrod diameter: 5/16" (width of slot in guide plate).
WarrantyInstallation InstructionsInstallation InstructionsThis Part Fits:
| Year |
Make |
Model |
Submodel |
| 1965-1978 |
Pontiac |
Bonneville |
Base |
| 1976-1978 |
Pontiac |
Bonneville |
Brougham |
| 1965-1970,1978 |
Pontiac |
Bonneville |
Safari |
| 1965-1967 |
Pontiac |
Catalina |
2+2 |
| 1965-1978 |
Pontiac |
Catalina |
Base |
| 1971-1972 |
Pontiac |
Catalina |
Brougham |
| 1965-1978 |
Pontiac |
Catalina |
Safari |
| 1965-1970 |
Pontiac |
Catalina |
Ventura |
| 1967-1970 |
Pontiac |
Executive |
Base |
| 1967-1970 |
Pontiac |
Executive |
Safari |
| 1968-1969 |
Pontiac |
Firebird |
400 |
| 1968-1977 |
Pontiac |
Firebird |
Base |
| 1970-1974,1976 |
Pontiac |
Firebird |
Esprit |
| 1970-1979 |
Pontiac |
Firebird |
Formula |
| 1969-1979 |
Pontiac |
Firebird |
Trans Am |
| 1973-1975 |
Pontiac |
Grand Am |
Base |
| 1975-1977 |
Pontiac |
Grand LeMans |
Base |
| 1975,1977 |
Pontiac |
Grand LeMans |
Safari |
| 1965-1974,1976-1977 |
Pontiac |
Grand Prix |
Base |
| 1975,1977 |
Pontiac |
Grand Prix |
LJ |
| 1975-1977 |
Pontiac |
Grand Prix |
SJ |
| 1971-1978 |
Pontiac |
Grand Safari |
Base |
| 1971-1974 |
Pontiac |
Grandville |
Base |
| 1975 |
Pontiac |
Grandville |
Brougham |
| 1965-1966,1968-1973 |
Pontiac |
GTO |
Base |
| 1970-1971 |
Pontiac |
GTO |
The Judge |
| 1968-1977 |
Pontiac |
LeMans |
Base |
| 1972-1974 |
Pontiac |
LeMans |
Luxury |
| 1969-1970,1973-1975,1977 |
Pontiac |
LeMans |
Safari |
| 1974 |
Pontiac |
LeMans |
Safari Luxury |
| 1970-1977 |
Pontiac |
LeMans |
Sport |
| 1971 |
Pontiac |
LeMans |
T37 |
| 1965-1966 |
Pontiac |
Star Chief |
Base |
| 1966 |
Pontiac |
Star Chief |
Executive |
| 1968,1970 |
Pontiac |
Tempest |
Base |
| 1968 |
Pontiac |
Tempest |
Custom |
| 1970 |
Pontiac |
Tempest |
GT |
| 1968 |
Pontiac |
Tempest |
Safari |
