- Retro-Fit Hydraulic Roller
- Ford 5.0L 8 cyl. 1982-2001
- Street/strip Needs 9.5:1 compression, 2800+ stall, intake, gears & headers Very rough idle
- Thumpr -Optimize engine character & sound, while providing excellent valvetrain stability & a wide power range
Specifications
RPM Range: 2500 to 6200
Valve Timing: .006
Lobe Separation: 107°
Intake Centerline: 102°
Intake Valve Lash: Hydraulic
Exhaust Valve Lash: Hydraulic
Intake Duration: 299
Exhaust Duration: 319
Intake Duration @ .050" Lift: 243
Exhaust Duration @ .050" Lift: 257
Intake Valve Lift: 0.533
Exhaust Valve Lift: 0.519
Intake Lobe Lift: .3550
Exhaust Lobe Lift: .3460
Vehicle Fitments:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1995 - 1996 | AM General | Hummer | Base |
| 1980 - 1991 | Avanti | II | Base |
| 1985 | Avanti | II | GT |
| 1980 | Buick | Century | Base, Estate, Sport, Limited |
| 1991 - 1996 | Buick | Commercial Chassis | Base |
| 1980 | Buick | Regal | Limited, Sport, Base |
| 1991 - 1995 | Buick | Roadmaster | Estate Wagon |
| 1996 | Buick | Roadmaster | Estate Wagon Collector's Edition, Limited Collector's Edition, Collector's Edition |
| 1992 - 1995 | Buick | Roadmaster | Limited, Base |
| 1990 - 1992 | Cadillac | Brougham | Base, d'Elegance |
| 1992 - 1996 | Cadillac | Commercial Chassis | Brougham, Base |
| 1993 - 1996 | Cadillac | Fleetwood | Base, Brougham |
| 1980 - 1982 | Checker | Marathon | Base, Deluxe |
| 1992 - 1993 | Chevrolet | Blazer | Cheyenne |
| 1987 | Chevrolet | Blazer | Custom Deluxe |
| 1991 - 1994 | Chevrolet | Blazer | Nevada |
| 1988 - 1991 | Chevrolet | Blazer | Scottsdale |
| 1987 - 1994 | Chevrolet | Blazer | Silverado |
| 1994 | Chevrolet | Blazer | Silverado Sport, Base |
| 1980 | Chevrolet | C10 | Big Ten, Custom Deluxe |
| 1980 - 1981 | Chevrolet | C10 | Cheyenne |
| 1981 | Chevrolet | C10 | Deluxe |
| 1980 - 1986 | Chevrolet | C10 | Silverado, Custom, Scottsdale |
| 1981 - 1986 | Chevrolet | C10 Suburban | Custom |
| 1980 | Chevrolet | C10 Suburban | Custom Deluxe |
| 1981 | Chevrolet | C10 Suburban | Deluxe |
| 1980 - 1986 | Chevrolet | C10 Suburban | Scottsdale, Silverado |
| 1990 - 1993 | Chevrolet | C1500 | 454 SS |
| 1989 - 1995 | Chevrolet | C1500 | Base |
| 1988 - 1992 | Chevrolet | C1500 | Scottsdale |
| 1988 - 1995 | Chevrolet | C1500 | Silverado, Cheyenne |
| 1990 - 1995 | Chevrolet | C1500 | WT |
| 1992 - 1995 | Chevrolet | C1500 Suburban | Base |
| 1995 | Chevrolet | C1500 Suburban | LT, LS |
| 1992 - 1994 | Chevrolet | C1500 Suburban | Silverado |
| 1986 | Chevrolet | C20 | Base |
| 1981 - 1986 | Chevrolet | C20 | Custom |
| 1980 | Chevrolet | C20 | Custom Deluxe |
| 1981 | Chevrolet | C20 | Deluxe |
| 1980 - 1986 | Chevrolet | C20 | Scottsdale, Silverado, Cheyenne |
| 1981 - 1986 | Chevrolet | C20 Suburban | Custom |
| 1980 | Chevrolet | C20 Suburban | Custom Deluxe |
| 1981 | Chevrolet | C20 Suburban | Deluxe |
| 1980 - 1986 | Chevrolet | C20 Suburban | Scottsdale, Silverado |
| 1993 | Chevrolet | C2500 | 400 SS, Custom |
| 1988 - 1992 | Chevrolet | C2500 | Scottsdale |
| 1988 - 1995 | Chevrolet | C2500 | Silverado, Base, Cheyenne |
| 1994 - 1995 | Chevrolet | C2500 | WT |
| 1992 - 1995 | Chevrolet | C2500 Suburban | Base |
| 1995 | Chevrolet | C2500 Suburban | LS, LT |
| 1992 - 1994 | Chevrolet | C2500 Suburban | Silverado |
| 1980 - 1982 | Chevrolet | C30 | Base |
| 1980 - 1981 | Chevrolet | C30 | Cheyenne |
| 1981 - 1986 | Chevrolet | C30 | Custom |
| 1980 | Chevrolet | C30 | Custom Deluxe |
| 1981 | Chevrolet | C30 | Deluxe |
| 1980 - 1986 | Chevrolet | C30 | Scottsdale, Silverado |
| 1994 - 1995 | Chevrolet | C3500 | Base |
| 1988 - 1992 | Chevrolet | C3500 | Scottsdale |
| 1988 - 1995 | Chevrolet | C3500 | Silverado, Cheyenne |
| 1985 - 1986 | Chevrolet | Camaro | Iroc-Z |
| 1980 | Chevrolet | Camaro | Rally Sport, Base |
| 1981 - 1986 | Chevrolet | Camaro | Sport |
| 1982 | Chevrolet | Camaro | Z28 Indianapolis 500 Pace Car |
| 1980 - 1986 | Chevrolet | Camaro | Z28, Berlinetta |
| 1980 - 1992 | Chevrolet | Caprice | Base |
| 1980 - 1996 | Chevrolet | Caprice | Classic |
| 1986 - 1990 | Chevrolet | Caprice | Classic Brougham |
| 1981 - 1982 | Chevrolet | Caprice | Classic Estate |
| 1980 - 1981 | Chevrolet | Caprice | Classic Landau |
| 1993 - 1994 | Chevrolet | Caprice | Classic LS |
| 1987 - 1990 | Chevrolet | Caprice | Classic LS Brougham |
| 1991 - 1993 | Chevrolet | Caprice | Classic LTZ |
| 1980 | Chevrolet | Caprice | Classic Sport |
| 1991 - 1994 | Chevrolet | Commercial Chassis | Base |
| 1980 - 1986 | Chevrolet | Corvette | Base |
| 1982 | Chevrolet | Corvette | Collector's Edition |
| 1986 | Chevrolet | Corvette | Indianapolis 500 Pace Car |
| 1980 - 1987 | Chevrolet | El Camino | Base, SS |
| 1981 - 1986 | Chevrolet | El Camino | Conquista |
| 1980 - 1981 | Chevrolet | El Camino | Royal Knight |
| 1996 | Chevrolet | Express 2500 | LS, Base |
| 1983 | Chevrolet | G10 | Base |
| 1980 - 1995 | Chevrolet | G10 | Beauville, Chevy Van, Sportvan |
| 1981 - 1987 | Chevrolet | G10 | Bonaventure |
| 1995 | Chevrolet | G20 | Base |
| 1980 - 1995 | Chevrolet | G20 | Beauville, Chevy Van, Sportvan |
| 1983 - 1984 | Chevrolet | G20 | Bonaventure |
| 1980 - 1981 | Chevrolet | G20 | Nomad |
| 1980 - 1996 | Chevrolet | G30 | Beauville, Chevy Van, Sportvan, Hi-Cube |
| 1983 - 1984 | Chevrolet | G30 | Bonaventure |
| 1980 - 1985 | Chevrolet | Impala | Base |
| 1981 - 1982 | Chevrolet | Impala | Estate |
| 1980 | Chevrolet | Impala | Sport |
| 1994 - 1996 | Chevrolet | Impala | SS |
| 1980 - 1981 | Chevrolet | K10 | Cheyenne |
| 1981 - 1986 | Chevrolet | K10 | Custom |
| 1980 | Chevrolet | K10 | Custom Deluxe |
| 1981 | Chevrolet | K10 | Deluxe |
| 1980 - 1986 | Chevrolet | K10 | Scottsdale, Silverado |
| 1981 - 1986 | Chevrolet | K10 Suburban | Custom |
| 1980 | Chevrolet | K10 Suburban | Custom Deluxe |
| 1981 | Chevrolet | K10 Suburban | Deluxe |
| 1980 - 1986 | Chevrolet | K10 Suburban | Scottsdale, Silverado |
| 1994 - 1995 | Chevrolet | K1500 | Base |
| 1988 - 1992 | Chevrolet | K1500 | Scottsdale |
| 1988 - 1995 | Chevrolet | K1500 | Silverado, Cheyenne |
| 1991 | Chevrolet | K1500 | Sport |
| 1990 - 1995 | Chevrolet | K1500 | WT |
| 1992 - 1995 | Chevrolet | K1500 Suburban | Base |
| 1995 | Chevrolet | K1500 Suburban | LS, LT |
| 1992 - 1994 | Chevrolet | K1500 Suburban | Silverado |
| 1980 - 1981 | Chevrolet | K20 | Cheyenne |
| 1981 - 1986 | Chevrolet | K20 | Custom |
| 1980 | Chevrolet | K20 | Custom Deluxe |
| 1981 | Chevrolet | K20 | Deluxe |
| 1980 - 1986 | Chevrolet | K20 | Scottsdale, Silverado |
| 1981 - 1986 | Chevrolet | K20 Suburban | Custom |
| 1980 | Chevrolet | K20 Suburban | Custom Deluxe |
| 1981 | Chevrolet | K20 Suburban | Deluxe |
| 1980 - 1986 | Chevrolet | K20 Suburban | Scottsdale, Silverado |
| 1994 - 1995 | Chevrolet | K2500 | Base, WT |
| 1988 - 1992 | Chevrolet | K2500 | Scottsdale |
| 1988 - 1995 | Chevrolet | K2500 | Silverado, Cheyenne |
| 1992 - 1995 | Chevrolet | K2500 Suburban | Base |
| 1995 | Chevrolet | K2500 Suburban | LS, LT |
| 1992 - 1994 | Chevrolet | K2500 Suburban | Silverado |
| 1980 - 1981 | Chevrolet | K30 | Cheyenne |
| 1981 - 1986 | Chevrolet | K30 | Custom |
| 1980 | Chevrolet | K30 | Custom Deluxe |
| 1981 | Chevrolet | K30 | Deluxe |
| 1980 - 1986 | Chevrolet | K30 | Silverado, Scottsdale |
| 1994 - 1995 | Chevrolet | K3500 | Base |
| 1988 - 1992 | Chevrolet | K3500 | Scottsdale |
| 1988 - 1995 | Chevrolet | K3500 | Silverado, Cheyenne |
| 1980 | Chevrolet | K5 Blazer | Cheyenne, Custom Deluxe |
| 1981 - 1986 | Chevrolet | K5 Blazer | Custom |
| 1981 | Chevrolet | K5 Blazer | Deluxe |
| 1984 | Chevrolet | K5 Blazer | Scottsdale |
| 1980 - 1986 | Chevrolet | K5 Blazer | Silverado |
| 1980 - 1981 | Chevrolet | Malibu | Base, Classic Landau |
| 1980 - 1983 | Chevrolet | Malibu | Classic |
| 1980 | Chevrolet | Malibu | Classic Estate, Sport, Classic Sport, Estate |
| 1981 - 1988 | Chevrolet | Monte Carlo | Base |
| 1983 | Chevrolet | Monte Carlo | CL |
| 1980 - 1981 | Chevrolet | Monte Carlo | Landau |
| 1986 - 1988 | Chevrolet | Monte Carlo | LS |
| 1980 | Chevrolet | Monte Carlo | Sport |
| 1983 - 1988 | Chevrolet | Monte Carlo | SS |
| 1980 - 1989 | Chevrolet | P20 | Step-Van, Base |
| 1980 - 1996 | Chevrolet | P30 | Base |
| 1980 - 1990 | Chevrolet | P30 | Step-Van |
| 1987 | Chevrolet | R10 | Custom Deluxe, Silverado, Scottsdale |
| 1987 | Chevrolet | R10 Suburban | Custom Deluxe |
| 1987 - 1988 | Chevrolet | R10 Suburban | Scottsdale, Silverado |
| 1989 - 1991 | Chevrolet | R1500 Suburban | Scottsdale, Silverado |
| 1988 | Chevrolet | R20 | Cheyenne |
| 1987 - 1988 | Chevrolet | R20 | Custom Deluxe, Silverado, Scottsdale |
| 1987 | Chevrolet | R20 Suburban | Custom Deluxe |
| 1987 - 1988 | Chevrolet | R20 Suburban | Silverado, Scottsdale |
| 1989 | Chevrolet | R2500 | Scottsdale, Silverado, Cheyenne |
| 1989 - 1991 | Chevrolet | R2500 Suburban | Scottsdale, Silverado |
| 1988 | Chevrolet | R30 | Cheyenne |
| 1987 - 1988 | Chevrolet | R30 | Silverado, Custom Deluxe, Scottsdale |
| 1989 - 1991 | Chevrolet | R3500 | Cheyenne, Silverado |
| 1989 - 1990 | Chevrolet | R3500 | Scottsdale |
| 1995 | Chevrolet | Tahoe | Base, LS, LT |
| 1987 | Chevrolet | V10 | Scottsdale, Custom Deluxe, Silverado |
| 1987 | Chevrolet | V10 Suburban | Custom Deluxe |
| 1987 - 1988 | Chevrolet | V10 Suburban | Scottsdale, Silverado |
| 1989 - 1991 | Chevrolet | V1500 Suburban | Silverado, Scottsdale |
| 1987 | Chevrolet | V20 | Silverado, Custom Deluxe, Scottsdale |
| 1987 | Chevrolet | V20 Suburban | Custom Deluxe |
| 1987 - 1988 | Chevrolet | V20 Suburban | Scottsdale, Silverado |
| 1989 - 1991 | Chevrolet | V2500 Suburban | Silverado, Scottsdale |
| 1988 | Chevrolet | V30 | Cheyenne |
| 1987 - 1988 | Chevrolet | V30 | Silverado, Scottsdale, Custom Deluxe |
| 1989 - 1991 | Chevrolet | V3500 | Cheyenne, Silverado |
| 1989 - 1990 | Chevrolet | V3500 | Scottsdale |
| 1993 | Excalibur | Limited | Base |
| 1985 | Excalibur | Phaeton | Anniversary |
| 1980 - 1989 | Excalibur | Phaeton | Base |
| 1980 | GMC | C1500 | Heavy Half |
| 1980 - 1986 | GMC | C1500 | Sierra Classic, High Sierra, Base |
| 1980 - 1982 | GMC | C1500 | Sierra Grande, Street Coupe |
| 1988 - 1995 | GMC | C1500 | Sierra SLE |
| 1988 - 1993 | GMC | C1500 | Sierra SLX, Sierra |
| 1994 - 1995 | GMC | C1500 | Sierra Special, Sierra SLT, Sierra SL |
| 1980 - 1995 | GMC | C1500 Suburban | Base |
| 1980 - 1986 | GMC | C1500 Suburban | High Sierra, Sierra Classic |
| 1980 - 1982 | GMC | C1500 Suburban | Sierra Grande |
| 1992 - 1995 | GMC | C1500 Suburban | SLE |
| 1995 | GMC | C1500 Suburban | SLT |
| 1980 - 1986 | GMC | C2500 | Base, Sierra Classic, High Sierra |
| 1980 - 1982 | GMC | C2500 | Sierra Grande |
| 1988 - 1995 | GMC | C2500 | Sierra SLE |
| 1994 - 1995 | GMC | C2500 | Sierra SLT, Sierra SL |
| 1988 - 1993 | GMC | C2500 | Sierra, Sierra SLX |
| 1980 - 1995 | GMC | C2500 Suburban | Base |
| 1980 - 1986 | GMC | C2500 Suburban | High Sierra, Sierra Classic |
| 1980 - 1982 | GMC | C2500 Suburban | Sierra Grande |
| 1992 - 1995 | GMC | C2500 Suburban | SLE |
| 1995 | GMC | C2500 Suburban | SLT |
| 1980 - 1986 | GMC | C3500 | High Sierra, Sierra Classic, Base |
| 1980 - 1982 | GMC | C3500 | Sierra Grande |
| 1988 - 1995 | GMC | C3500 | Sierra SLE |
| 1994 - 1995 | GMC | C3500 | Sierra SLT, Sierra SL |
| 1988 - 1993 | GMC | C3500 | Sierra SLX, Sierra |
| 1981 - 1986 | GMC | Caballero | Amarillo |
| 1980 - 1987 | GMC | Caballero | Base, Diablo |
| 1980 | GMC | Caballero | Laredo |
| 1981 | GMC | Caballero | Royal Knight, Conquista |
| 1983 - 1984 | GMC | G1500 | Rally Custom |
| 1980 - 1995 | GMC | G1500 | Rally STX, Vandura, Rally |
| 1983 - 1984 | GMC | G2500 | Rally Custom |
| 1980 - 1995 | GMC | G2500 | Rally, Vandura, Rally STX |
| 1981 - 1988 | GMC | G3500 | Rally Custom |
| 1980 - 1996 | GMC | G3500 | Vandura, Vandura Special, Rally Camper Special, Rally, Rally STX, Magnavan |
| 1980 - 1991 | GMC | Jimmy | Base |
| 1980 - 1985 | GMC | Jimmy | High Sierra |
| 1980 - 1990 | GMC | Jimmy | Sierra Classic |
| 1986 | GMC | Jimmy | Silverado |
| 1980 - 1982 | GMC | Jimmy | Street Coupe, Sierra Grande |
| 1980 - 1986 | GMC | K1500 | High Sierra, Base, Sierra Classic |
| 1980 - 1982 | GMC | K1500 | Sierra Grande |
| 1994 - 1995 | GMC | K1500 | Sierra SL, Sierra SLT, Sierra Special |
| 1988 - 1995 | GMC | K1500 | Sierra SLE |
| 1995 | GMC | K1500 | Sierra SLS |
| 1988 - 1993 | GMC | K1500 | Sierra SLX, Sierra |
| 1993 | GMC | K1500 | Sierra Sport |
| 1980 - 1995 | GMC | K1500 Suburban | Base |
| 1980 - 1986 | GMC | K1500 Suburban | High Sierra, Sierra Classic |
| 1980 - 1982 | GMC | K1500 Suburban | Sierra Grande |
| 1992 - 1995 | GMC | K1500 Suburban | SLE |
| 1995 | GMC | K1500 Suburban | SLT |
| 1980 - 1986 | GMC | K2500 | High Sierra, Base, Sierra Classic |
| 1980 - 1982 | GMC | K2500 | Sierra Grande |
| 1988 - 1995 | GMC | K2500 | Sierra SLE |
| 1994 - 1995 | GMC | K2500 | Sierra SLT, Sierra SL |
| 1988 - 1993 | GMC | K2500 | Sierra SLX, Sierra |
| 1980 - 1995 | GMC | K2500 Suburban | Base |
| 1980 - 1986 | GMC | K2500 Suburban | Sierra Classic, High Sierra |
| 1980 - 1982 | GMC | K2500 Suburban | Sierra Grande |
| 1992 - 1995 | GMC | K2500 Suburban | SLE |
| 1995 | GMC | K2500 Suburban | SLT |
| 1980 - 1986 | GMC | K3500 | High Sierra, Sierra Classic, Base |
| 1980 - 1982 | GMC | K3500 | Sierra Grande |
| 1994 - 1995 | GMC | K3500 | Sierra SL, Sierra SLT |
| 1988 - 1995 | GMC | K3500 | Sierra SLE |
| 1988 - 1993 | GMC | K3500 | Sierra SLX, Sierra |
| 1980 - 1989 | GMC | P2500 | Base, Value Van |
| 1980 - 1996 | GMC | P3500 | Base |
| 1980 - 1990 | GMC | P3500 | Value Van |
| 1987 | GMC | R1500 | High Sierra, Base, Sierra Classic |
| 1987 - 1991 | GMC | R1500 Suburban | Base |
| 1987 | GMC | R1500 Suburban | High Sierra |
| 1987 - 1989 | GMC | R1500 Suburban | Sierra Classic |
| 1990 | GMC | R1500 Suburban | SLE |
| 1987 - 1989 | GMC | R2500 | Sierra Classic, Base, High Sierra |
| 1987 - 1991 | GMC | R2500 Suburban | Base |
| 1987 | GMC | R2500 Suburban | High Sierra |
| 1987 - 1989 | GMC | R2500 Suburban | Sierra Classic |
| 1990 | GMC | R2500 Suburban | SLE |
| 1987 - 1991 | GMC | R3500 | Base |
| 1987 - 1989 | GMC | R3500 | High Sierra, Sierra Classic |
| 1990 - 1991 | GMC | R3500 | SLE |
| 1987 | GMC | V1500 | Sierra Classic, High Sierra, Base |
| 1987 - 1991 | GMC | V1500 Suburban | Base |
| 1987 | GMC | V1500 Suburban | High Sierra |
| 1987 - 1989 | GMC | V1500 Suburban | Sierra Classic |
| 1990 | GMC | V1500 Suburban | SLE |
| 1987 | GMC | V2500 | Base, Sierra Classic, High Sierra |
| 1987 - 1991 | GMC | V2500 Suburban | Base |
| 1987 | GMC | V2500 Suburban | High Sierra |
| 1987 - 1989 | GMC | V2500 Suburban | Sierra Classic |
| 1990 | GMC | V2500 Suburban | SLE |
| 1987 - 1991 | GMC | V3500 | Base |
| 1987 - 1989 | GMC | V3500 | High Sierra, Sierra Classic |
| 1990 - 1991 | GMC | V3500 | SLE |
| 1993 | GMC | Yukon | GT |
| 1992 - 1995 | GMC | Yukon | SLE, Base |
| 1995 | GMC | Yukon | SLT |
| 1992 - 1994 | GMC | Yukon | Sport |
| 1991 - 1992 | Oldsmobile | Custom Cruiser | Base |
| 1980 | Oldsmobile | Cutlass | Base, LS, Brougham |
| 1980 | Oldsmobile | Cutlass Calais | Base |
| 1980 - 1982 | Oldsmobile | Cutlass Cruiser | Base |
| 1980 | Oldsmobile | Cutlass Cruiser | Brougham |
| 1980 | Oldsmobile | Cutlass Salon | Base, Brougham |
| 1980 | Oldsmobile | Cutlass Supreme | Brougham, Base |
| 1983 - 1986 | Pontiac | Bonneville | Base, Brougham |
| 1984 - 1986 | Pontiac | Bonneville | LE |
| 1980 - 2002 | Pontiac | Firebird | Base, Formula, Trans Am |
| 1980 - 1981 | Pontiac | Firebird | Esprit |
| 1982 - 1986 | Pontiac | Firebird | S/E |
| 1994 | Pontiac | Firebird | Trans Am GT |
| 1989 - 1992 | Pontiac | Firebird | Trans Am GTA |
| 1989 | Pontiac | Firebird | Trans Am GTA SE |
| 1980 | Pontiac | Grand Am | Base |
| 1980 | Pontiac | Grand LeMans | LE, Safari, Base |
| 1980 - 1987 | Pontiac | Grand Prix | Base |
| 1983 - 1987 | Pontiac | Grand Prix | Brougham |
| 1984 - 1987 | Pontiac | Grand Prix | LE |
| 1980 - 1983 | Pontiac | Grand Prix | LJ |
| 1980 | Pontiac | Grand Prix | SJ |
| 1980 | Pontiac | LeMans | Base, Safari |
| 1983 - 1986 | Pontiac | Parisienne | Base, Brougham |