These Ultra Pro Magnum rockers are made of black oxide coated 8650 chromemoly steel that can withstand up to 850 lbs of spring pressure. These 1.52 ratio rockers fit SBC intake valves with a Twisted Wedge Head and a 7/16" stud.
Ultra Pro Magnumâ„¢ Roller Rocker Arms not only live up to the lofty standards of the original Pro Magnums but they also take Stud mount Rocker performance, stability and value to a whole new level. The 8650 chromemoly material and arched, web-like design deliver increased strength and rigidity while still reducing the moment of inertia and optimizing the dynamic balance. A unique black oxide exterior finish helps prevent corrosion and increases durability. Featuring Oversized trunnions, precision-sorted needle bearings and hardened Roller tips for the ultimate in performance and dependability. Optimized retainer and valve spring clearances allow for use of most diameter springs, retainers and +.050" locks without clearance or fitment issues.
Ultra Pro Magnumâ„¢ Roller Rocker Arms not only live up to the lofty standards of the original Pro Magnums but they also take Stud mount Rocker performance, stability and value to a whole new level. The 8650 chromemoly material and arched, web-like design deliver increased strength and rigidity while still reducing the moment of inertia and optimizing the dynamic balance. A unique black oxide exterior finish helps prevent corrosion and increases durability. Featuring Oversized trunnions, precision-sorted needle bearings and hardened Roller tips for the ultimate in performance and dependability. Optimized retainer and valve spring clearances allow for use of most diameter springs, retainers and +.050" locks without clearance or fitment issues.
- 7/16" Stud - 1.52 Ratio - Chevy V8 265-400 (SBC) with Twisted Wedge Heads. Designed for intake valves only. Twisted Wedge heads use standard SBC exhaust valve Rockers.
- Investment cast 8650 chromemoly body and arched, web-like design deliver increased strength and rigidity while still reducing the moment of inertia. Unique black oxide exterior finish helps prevent corrosion and increases durability.
- Optimized retainer and valve spring clearances allow for use of most diameter springs, retainers and +.050" locks without clearance or fitment issues.
- Feature Oversized trunnions, precision-sorted needle bearings and hardened Roller tips.
- Lifetime Warranty - So strong that we guarantee the Rocker bodies against breakage for life. For use with up to 850 lbs of open spring pressure.
Application Summary:
| Year | Make/Model |
|---|---|
| 1977-1980 | Buick Century |
| 1991-1993 | Buick Commercial Chassis |
| 1978 | Buick LeSabre |
| 1977-1980 | Buick Regal |
| 1991-1993 | Buick Roadmaster |
| 1977-1979 | Buick Skylark |
| 1990-1992 | Cadillac Brougham |
| 1992-1993 | Cadillac Commercial Chassis |
| 1980 | Cadillac Eldorado |
| 1993 | Cadillac Fleetwood |
| 1980 | Cadillac Seville |
| 1975-1982 | Checker Marathon |
| 1955-1975 | Chevrolet Bel Air |
| 1958-1972 | Chevrolet Biscayne |
| 1969-1974 | Chevrolet Blazer |
| 1987-1994 | Chevrolet Blazer |
| 1969-1972 | Chevrolet Brookwood |
| 1975-1986 | Chevrolet C10 |
| 1961-1974 | Chevrolet C10 Pickup |
| 1968-1986 | Chevrolet C10 Suburban |
| 1988-1995 | Chevrolet C1500 |
| 1992-1995 | Chevrolet C1500 Suburban |
| 1975-1986 | Chevrolet C20 |
| 1961-1974 | Chevrolet C20 Pickup |
| 1968-1986 | Chevrolet C20 Suburban |
| 1988-1995 | Chevrolet C2500 |
| 1992-1995 | Chevrolet C2500 Suburban |
| 1975-1986 | Chevrolet C30 |
| 1961-1974 | Chevrolet C30 Pickup |
| 1988-1995 | Chevrolet C3500 |
| 1967-1973 | Chevrolet Camaro |
| 1975-1992 | Chevrolet Camaro |
| 1966-1996 | Chevrolet Caprice |
| 1964-1973 | Chevrolet Chevelle |
| 1963-1968 | Chevrolet Chevy II |
| 1955-1972 | Chevrolet Corvette |
| 1974-1982 | Chevrolet Corvette |
| 1984-1991 | Chevrolet Corvette |
| 1958 | Chevrolet Del Ray |
| 1959-1960 | Chevrolet El Camino |
| 1964-1987 | Chevrolet El Camino |
| 1975-1995 | Chevrolet G10 |
| 1968-1974 | Chevrolet G10 Van |
| 1975-1995 | Chevrolet G20 |
| 1968-1974 | Chevrolet G20 Van |
| 1975-1996 | Chevrolet G30 |
| 1970-1974 | Chevrolet G30 Van |
| 1959-1985 | Chevrolet Impala |
| 1975-1986 | Chevrolet K10 |
| 1961-1974 | Chevrolet K10 Pickup |
| 1968-1986 | Chevrolet K10 Suburban |
| 1988-1995 | Chevrolet K1500 |
| 1992-1995 | Chevrolet K1500 Suburban |
| 1975-1986 | Chevrolet K20 |
| 1961-1974 | Chevrolet K20 Pickup |
| 1968-1986 | Chevrolet K20 Suburban |
| 1988-1995 | Chevrolet K2500 |
| 1992-1995 | Chevrolet K2500 Suburban |
| 1977-1986 | Chevrolet K30 |
| 1968-1974 | Chevrolet K30 Pickup |
| 1988-1995 | Chevrolet K3500 |
| 1975-1986 | Chevrolet K5 Blazer |
| 1969-1972 | Chevrolet Kingswood |
| 1973-1976 | Chevrolet Laguna |
| 1964-1967 | Chevrolet Malibu |
| 1973-1983 | Chevrolet Malibu |
| 1970-1988 | Chevrolet Monte Carlo |
| 1976-1979 | Chevrolet Monza |
| Attributes | |
| Amazon ASIN | B005H89RDQ |
| ASIN | B005H89RDQ |
| C.A.R.B. E.O. Number | N/A |
| C.A.R.B. Exempt for Foreign Vehicles Manufactured Before 1967? | Yes, but must meet tailpipe emission standards for year of vehicle. |
| C.A.R.B. Exempt for On-Road Vehicles? | No |
| C.A.R.B. Exempt for Racing and Off-Road Only Vehicles? | Yes, but must be a race/competition only vehicle. |
| C.A.R.B. Exemption Reason | N/A |
| California Proposition 65 | WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov |
| Country of Origin (Primary) | US |
| Emission Code | Legal US |
| Engine Family | Chevrolet 262-400 c.i. 8 Cylinder (1958-1998) w/ Twisted Wedge Head, Intake Valve, Chevrolet 262-400 c.i. 8 Cylinder (1958-1998) w/ Twisted Wedge Head, Intake Valve |
| Engine Make/Size | Chevy Small Block (262-400) |
| Harmonized Tariff Code (Schedule B) | 8409914000 |
| Hazardous Material Code | N |
| Life Cycle Status Code | Available to Order |
| Maximum Valve Spring Open Pressure | 850, 850 |
| NAFTA Preference Criterion Code | B |
| Ratio | 1.52 |
| Rocker Arm Material | 8650 Chromemoly Steel, 8650 Chromemoly Steel |
| Rocker Arm Ratio | 1.52, 1.52 |
| Rocker Arm Series | Ultra Pro Magnum, Ultra Pro Magnum |
| Rocker Stud Diameter | 7/16, 7/16 |
| SDR Required Flag | N |
| SDS Sheet Number | N/A |
| Stud Size | 7/16 |
| GTIN | 00036584196341 |