Product Information
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).This Part Fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1975 | Buick | LeSabre | Custom |
| 1975 | Oldsmobile | 98 | Luxury |
| 1975 | Oldsmobile | 98 | Regency |
| 1975 | Oldsmobile | Custom Cruiser | Base |
| 1975 | Oldsmobile | Custom Cruiser | Panel |
| 1975 | Oldsmobile | Delta 88 | Base |
| 1975 | Oldsmobile | Delta 88 | Royale |
| 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 |
| 1967-1969 | Pontiac | Firebird | 400 |
| 1967-1977 | Pontiac | Firebird | Base |
| 1970-1974,1976 | Pontiac | Firebird | Esprit |
| 1970-1979 | Pontiac | Firebird | Formula |
| 1967 | Pontiac | Firebird | HO |
| 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 |
| 1965-1973 | 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 |
| 1968-1969 | Pontiac | Tempest | Custom |
| 1970 | Pontiac | Tempest | GT |
| 1968-1969 | Pontiac | Tempest | Safari |
