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Description
Comp Cams CB 299T HR-7 BMT Thumpr & Lifter KitBig Mutha Thumpr", 299T HR 7: Cam & Lifter Kit Hydraulic Roller: Street strip, needs 9. 5: 1 CR , 2800+ stall, intake, gears, and headers, very rough idle. Specifications Lifter Type: Hydraulic Roller Lifter Engine Family: Chevrolet 396 454 c. i. 8 CYL. 1965 1996 Cam Family: Thumpr" Retro Fit Hydraulic Roller Camshafts RPM Range: 2300 to 6100 Valve Timing: 0. 006 Lobe Separation: 107 Intake Centerline: 102 Valve Lash: Hyd.(Intake) Hyd.(Exhaust)
Big Mutha Thumpr", 299T HR-7: Cam & Lifter Kit
Hydraulic Roller: Street/strip, needs 9.5:1 CR , 2800+ stall, intake, gears, and headers, very rough idle.
Specifications
Lifter Type: Hydraulic Roller Lifter
Engine Family: Chevrolet 396-454 c.i. 8 CYL. 1965-1996
Cam Family: Thumpr" Retro-Fit Hydraulic Roller Camshafts
RPM Range: 2300 to 6100
Valve Timing: 0.006
Lobe Separation: 107°
Intake Centerline: 102°
Valve Lash: Hyd.(Intake)/ Hyd.(Exhaust)
Duration: 299(Intake)/ 319(Exhaust)
Duration @ .050" Lift: 243(Intake)/ 257(Exhaust)
Valve Lift: 0.57(Intake)/ 0.554(Exhaust)
Lobe Lift: 0.335(Intake)/ 0.326(Exhaust)
Vehicle Fitments:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1965 - 1975 | Chevrolet | Bel Air | Base |
| 1965 - 1972 | Chevrolet | Biscayne | Base |
| 1973 - 1974 | Chevrolet | Blazer | Base |
| 1969 - 1972 | Chevrolet | Brookwood | Base |
| 1978 - 1980 | Chevrolet | C10 | Big Ten |
| 1975 - 1980 | Chevrolet | C10 | Scottsdale, Custom Deluxe, Custom, Cheyenne, Silverado |
| 1968 - 1974 | Chevrolet | C10 Pickup | Base |
| 1968 - 1974 | Chevrolet | C10 Suburban | Base |
| 1975 - 1980 | Chevrolet | C10 Suburban | Scottsdale, Custom Deluxe, Silverado |
| 1990 - 1991 | Chevrolet | C1500 | Base |
| 1990 - 1992 | Chevrolet | C1500 | Scottsdale |
| 1990 - 1993 | Chevrolet | C1500 | WT, 454 SS, Cheyenne, Silverado |
| 1986 | Chevrolet | C20 | Base |
| 1981 - 1986 | Chevrolet | C20 | Custom |
| 1975 - 1980 | Chevrolet | C20 | Custom Deluxe |
| 1981 | Chevrolet | C20 | Deluxe |
| 1975 - 1986 | Chevrolet | C20 | Silverado, Scottsdale, Cheyenne |
| 1968 - 1974 | Chevrolet | C20 Pickup | Base |
| 1968 - 1974 | Chevrolet | C20 Suburban | Base |
| 1981 - 1986 | Chevrolet | C20 Suburban | Custom |
| 1975 - 1980 | Chevrolet | C20 Suburban | Custom Deluxe |
| 1981 | Chevrolet | C20 Suburban | Deluxe |
| 1975 - 1986 | Chevrolet | C20 Suburban | Scottsdale, Silverado |
| 1991 - 1996 | Chevrolet | C2500 | Base, Silverado, Cheyenne |
| 1993 | Chevrolet | C2500 | Custom, 400 SS |
| 1991 - 1992 | Chevrolet | C2500 | Scottsdale |
| 1994 - 1995 | Chevrolet | C2500 | WT |
| 1992 - 1996 | Chevrolet | C2500 Suburban | Base |
| 1995 - 1996 | Chevrolet | C2500 Suburban | LS, LT |
| 1992 - 1994 | Chevrolet | C2500 Suburban | Silverado |
| 1975 - 1982 | Chevrolet | C30 | Base |
| 1975 - 1981 | Chevrolet | C30 | Cheyenne |
| 1981 - 1986 | Chevrolet | C30 | Custom |
| 1975 - 1980 | Chevrolet | C30 | Custom Deluxe |
| 1981 | Chevrolet | C30 | Deluxe |
| 1975 - 1986 | Chevrolet | C30 | Silverado, Scottsdale |
| 1968 - 1974 | Chevrolet | C30 Pickup | Base |
| 1994 - 1996 | Chevrolet | C3500 | Base |
| 1988 - 1992 | Chevrolet | C3500 | Scottsdale |
| 1988 - 1996 | Chevrolet | C3500 | Silverado, Cheyenne |
| 1967 - 1972 | Chevrolet | Camaro | Base, Z28, RS, SS |
| 1966 - 1974 | Chevrolet | Caprice | Base |
| 1973 - 1976 | Chevrolet | Caprice | Classic |
| 1976 | Chevrolet | Caprice | Classic Estate, Classic Landau |
| 1975 - 1976 | Chevrolet | Caprice | Classic Sport |
| 1973 - 1974 | Chevrolet | Caprice | Estate |
| 1975 | Chevrolet | Caprice | Estate Wagon |
| 1967 - 1968 | Chevrolet | Chevelle | 300 |
| 1967 - 1969 | Chevrolet | Chevelle | 300 Deluxe |
| 1965 - 1972 | Chevrolet | Chevelle | Base, SS |
| 1967 - 1972 | Chevrolet | Chevelle | Concours |
| 1965 - 1973 | Chevrolet | Chevelle | Deluxe |
| 1969 - 1972 | Chevrolet | Chevelle | Greenbrier, Concours Estate |
| 1968 - 1972 | Chevrolet | Chevelle | Malibu, Nomad |
| 1968 | Chevrolet | Chevy II | Nova |
| 1967 - 1974 | Chevrolet | Corvette | Base |
| 1966 - 1975 | Chevrolet | El Camino | Base |
| 1975 | Chevrolet | El Camino | Classic |
| 1968 - 1974 | Chevrolet | El Camino | Custom |
| 1968 - 1975 | Chevrolet | El Camino | SS |
| 1969 - 1970 | Chevrolet | Estate | Base |
| 1996 | Chevrolet | Express 3500 | LS, Base |
| 1973 - 1974 | Chevrolet | G10 Van | Base, Sportvan |
| 1976 | Chevrolet | G20 | Sportvan, Chevy Van, Beauville |
| 1973 - 1974 | Chevrolet | G20 Van | Sportvan, Base |
| 1975 - 1996 | Chevrolet | G30 | Chevy Van, Sportvan, Beauville, Hi-Cube |
| 1973 - 1974 | Chevrolet | G30 Van | Base, Sportvan |
| 1965 - 1976 | Chevrolet | Impala | Base |
| 1976 | Chevrolet | Impala | S, Custom Landau |
| 1975 - 1976 | Chevrolet | Impala | Sport, Custom |
| 1965 - 1967 | Chevrolet | Impala | SS |
| 1976 - 1980 | Chevrolet | K10 | Silverado, Cheyenne, Scottsdale, Custom Deluxe |
| 1968 - 1974 | Chevrolet | K10 Pickup | Base |
| 1968 - 1974 | Chevrolet | K10 Suburban | Base |
| 1976 - 1980 | Chevrolet | K20 | Scottsdale, Silverado, Custom Deluxe, Cheyenne |
| 1968 - 1974 | Chevrolet | K20 Pickup | Base |
| 1968 - 1974 | Chevrolet | K20 Suburban | Base |
| 1985 | Chevrolet | K20 Suburban | Silverado, Custom, Scottsdale |
| 1994 - 1996 | Chevrolet | K2500 | Base |
| 1991 - 1992 | Chevrolet | K2500 | Scottsdale |
| 1991 - 1996 | Chevrolet | K2500 | Silverado, Cheyenne |
| 1994 - 1995 | Chevrolet | K2500 | WT |
| 1992 - 1996 | Chevrolet | K2500 Suburban | Base |
| 1995 - 1996 | Chevrolet | K2500 Suburban | LT, LS |
| 1992 - 1994 | Chevrolet | K2500 Suburban | Silverado |
| 1977 - 1981 | Chevrolet | K30 | Cheyenne |
| 1981 - 1986 | Chevrolet | K30 | Custom |
| 1977 - 1980 | Chevrolet | K30 | Custom Deluxe |
| 1981 | Chevrolet | K30 | Deluxe |
| 1977 - 1986 | Chevrolet | K30 | Scottsdale, Silverado |
| 1968 - 1974 | Chevrolet | K30 Pickup | Base |
| 1994 - 1996 | Chevrolet | K3500 | Base |
| 1988 - 1992 | Chevrolet | K3500 | Scottsdale |
| 1988 - 1996 | Chevrolet | K3500 | Silverado, Cheyenne |
| 1976 | Chevrolet | K5 Blazer | Base |
| 1976 - 1978 | Chevrolet | K5 Blazer | Cheyenne |
| 1977 - 1978 | Chevrolet | K5 Blazer | Custom Deluxe |
| 1978 | Chevrolet | K5 Blazer | Silverado |
| 1969 - 1972 | Chevrolet | Kingswood | Base, Estate |
| 1973 - 1975 | Chevrolet | Laguna | Base |
| 1973 | Chevrolet | Laguna | Estate |
| 1975 | Chevrolet | Laguna | S3 |
| 1974 | Chevrolet | Laguna | Type S-3 |
| 1966 - 1975 | Chevrolet | Malibu | Base |
| 1974 - 1975 | Chevrolet | Malibu | Classic |
| 1975 | Chevrolet | Malibu | Classic Estate |
| 1973 - 1974 | Chevrolet | Malibu | Estate |
| 1970 - 1974 | Chevrolet | Monte Carlo | Base |
| 1973 - 1974 | Chevrolet | Monte Carlo | Landau |
| 1973 - 1975 | Chevrolet | Monte Carlo | S |
| 1969 - 1972 | Chevrolet | Nova | Base |
| 1973 | Chevrolet | P10 Van | Base |
| 1976 - 1979 | Chevrolet | P20 | Step-Van, Base |
| 1970 - 1973 | Chevrolet | P20 Van | Base |
| 1975 - 1997 | Chevrolet | P30 | Base |
| 1975 - 1990 | Chevrolet | P30 | Step-Van |
| 1970 - 1974 | Chevrolet | P30 Van | Base |
| 1988 | Chevrolet | R20 | Cheyenne |
| 1987 - 1988 | Chevrolet | R20 | Scottsdale, Custom Deluxe, Silverado |
| 1987 | Chevrolet | R20 Suburban | Custom Deluxe |
| 1987 - 1988 | Chevrolet | R20 Suburban | Scottsdale, Silverado |
| 1989 | Chevrolet | R2500 | Scottsdale, Silverado, Cheyenne |
| 1989 - 1991 | Chevrolet | R2500 Suburban | Scottsdale, Silverado |
| 1988 | Chevrolet | R30 | Cheyenne |
| 1987 - 1988 | Chevrolet | R30 | Custom Deluxe, Scottsdale, Silverado |
| 1989 - 1991 | Chevrolet | R3500 | Cheyenne, Silverado |
| 1989 - 1990 | Chevrolet | R3500 | Scottsdale |
| 1969 - 1972 | Chevrolet | Townsman | Base |
| 1987 | Chevrolet | V20 Suburban | Custom Deluxe |
| 1987 - 1988 | Chevrolet | V20 Suburban | Scottsdale, Silverado |
| 1990 | Chevrolet | V2500 Suburban | Silverado, Scottsdale |
| 1988 | Chevrolet | V30 | Cheyenne |
| 1987 - 1988 | Chevrolet | V30 | Custom Deluxe, Scottsdale, Silverado |
| 1989 - 1991 | Chevrolet | V3500 | Cheyenne, Silverado |
| 1989 - 1990 | Chevrolet | V3500 | Scottsdale |
| 1972 - 1979 | Excalibur | Phaeton | Base |
| 1977 - 1978 | GMC | C15 | Heavy Half |
| 1977 | GMC | C15 | Indy Hauler |
| 1975 - 1978 | GMC | C15 | Sierra Classic, High Sierra, Sierra Grande, Base |
| 1978 | GMC | C15 | Street Coupe |
| 1975 - 1978 | GMC | C15 Suburban | Sierra Grande, Base, High Sierra, Sierra Classic |
| 1968 - 1974 | GMC | C15/C1500 Pickup | Base |
| 1968 - 1974 | GMC | C15/C1500 Suburban | Base |
| 1979 - 1980 | GMC | C1500 | Heavy Half, Base, Sierra Grande, Street Coupe, Sierra Classic, High Sierra |
| 1979 - 1980 | GMC | C1500 Suburban | Sierra Grande, High Sierra, Sierra Classic, Base |
| 1975 - 1978 | GMC | C25 | High Sierra, Sierra Grande, Base, Sierra Classic |
| 1975 - 1978 | GMC | C25 Suburban | Base, Sierra Classic, Sierra Grande, High Sierra |
| 1968 - 1974 | GMC | C25/C2500 Pickup | Base |
| 1968 - 1974 | GMC | C25/C2500 Suburban | Base |
| 1979 - 1986 | GMC | C2500 | Sierra Classic, Base, High Sierra |
| 1979 - 1982 | GMC | C2500 | Sierra Grande |
| 1991 - 1996 | GMC | C2500 | Sierra SLE |
| 1994 - 1996 | GMC | C2500 | Sierra SLT, Sierra SL |
| 1991 - 1993 | GMC | C2500 | Sierra SLX, Sierra |
| 1979 - 1996 | GMC | C2500 Suburban | Base |
| 1979 - 1986 | GMC | C2500 Suburban | High Sierra, Sierra Classic |
| 1979 - 1982 | GMC | C2500 Suburban | Sierra Grande |
| 1992 - 1996 | GMC | C2500 Suburban | SLE |
| 1995 - 1996 | GMC | C2500 Suburban | SLT |
| 1975 - 1978 | GMC | C35 | Base, Sierra Classic, High Sierra, Sierra Grande |
| 1968 - 1974 | GMC | C35/C3500 Pickup | Base |
| 1979 - 1986 | GMC | C3500 | High Sierra, Sierra Classic, Base |
| 1979 - 1982 | GMC | C3500 | Sierra Grande |
| 1994 - 1996 | GMC | C3500 | Sierra SL, Sierra SLT |
| 1988 - 1996 | GMC | C3500 | Sierra SLE |
| 1988 - 1993 | GMC | C3500 | Sierra SLX, Sierra |
| 1975 - 1976 | GMC | G25 | Rally STX, Vandura, Rally |
| 1976 | GMC | G35 | Rally Camper Special, Vandura, Vandura Special, Magnavan, Rally STX, Rally |
| 1974 | GMC | G35/G3500 Van | Base |
| 1973 - 1974 | GMC | G35/G3500 Van | Rally, Vandura |
| 1988 | GMC | G3500 | Rally Custom |
| 1988 - 1996 | GMC | G3500 | Vandura Special, Rally Camper Special, Rally STX, Rally, Magnavan, Vandura |
| 1973 - 1976 | GMC | Jimmy | Base |
| 1976 | GMC | Jimmy | Sierra Classic, High Sierra, Sierra Grande |
| 1976 | GMC | K15 | Sierra Classic, High Sierra, Sierra Grande, Base |
| 1968 - 1974 | GMC | K15/K1500 Pickup | Base |
| 1968 - 1974 | GMC | K15/K1500 Suburban | Base |
| 1979 - 1980 | GMC | K1500 | High Sierra, Base, Sierra Classic, Sierra Grande |
| 1976 - 1978 | GMC | K25 | Sierra Classic, Base, Sierra Grande, High Sierra |
| 1976 - 1977 | GMC | K25 Suburban | Sierra Grande, High Sierra, Sierra Classic, Base |
| 1968 - 1974 | GMC | K25/K2500 Pickup | Base |
| 1968 - 1974 | GMC | K25/K2500 Suburban | Base |
| 1991 - 1996 | GMC | K2500 | Sierra SLE |
| 1994 - 1996 | GMC | K2500 | Sierra SLT, Sierra SL |
| 1991 - 1993 | GMC | K2500 | Sierra, Sierra SLX |
| 1992 - 1996 | GMC | K2500 Suburban | Base, SLE |
| 1995 - 1996 | GMC | K2500 Suburban | SLT |
| 1968 - 1974 | GMC | K35/K3500 Pickup | Base |
| 1979 - 1986 | GMC | K3500 | Sierra Classic, High Sierra, Base |
| 1979 - 1982 | GMC | K3500 | Sierra Grande |
| 1994 - 1996 | GMC | K3500 | Sierra SL, Sierra SLT |
| 1988 - 1996 | GMC | K3500 | Sierra SLE |
| 1988 - 1993 | GMC | K3500 | Sierra, Sierra SLX |
| 1979 | GMC | P1500 | Base, Value Van |
| 1970 - 1971 | GMC | P25/P2500 Van | Base |
| 1975 - 1978 | GMC | P35 | Value Van, Base |
| 1970 - 1974 | GMC | P35/P3500 Van | Base |
| 1974 | GMC | P35/P3500 Van | Motorhome |
| 1979 - 1997 | GMC | P3500 | Base |
| 1979 - 1990 | GMC | P3500 | Value Van |
| 1987 - 1989 | GMC | R2500 | Base, High Sierra, Sierra Classic |
| 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 |
| 1996 | GMC | Savana 3500 | Base, SLE |
| 1971 - 1975 | GMC | Sprint | Base |
| 1972 - 1974 | GMC | Sprint | Custom |
| 1975 | GMC | Sprint | SP, High Sierra, Classic |
| 1987 - 1991 | GMC | V3500 | Base |
| 1987 - 1989 | GMC | V3500 | High Sierra, Sierra Classic |
| 1990 - 1991 | GMC | V3500 | SLE |
| 1969 - 1974 | Iso | Grifo | Base |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.8 ★★★★★
Based on 17 reviews
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Product Reviews
★★★★★ 5
A Must Have For Sound Deadening Materials
Size: 3 Pack
I applied Silex sound deadening material to the rear interior of a Ford Maverick truck cab. Lots of narrow areas, and lots of curved surfaces. This set was a must to properly apply the mats to the metal surface. There were places that I had to push down with my fingers due to obstacles like seat belt mounts, but I could tell that I was not getting the same results as I was with the crimped rollers.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 5, 2026
★★★★★ 5
Would recommend
Size: 10 sqft
I used this sound deadening material in my car during an audio and interior upgrade, and the difference was noticeable immediately. Road noise, vibrations, and rattling were reduced a lot, especially on the doors and floor panels. The car feels much quieter and more solid while driving now.
The material was easy to cut and apply, and the adhesive stuck very well without peeling up. It has a quality feel to it and conforms nicely around curves and tight areas. I also noticed my speakers sound cleaner and have better bass response after installing it.
For the price, this sound deadening material is a great value and definitely worth it if you want a quieter ride and better overall sound quality in your vehicle.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 6, 2026
★★★★★ 5
Worth it!
Size: 50 sqft
I was worried it wouldn't work as well since it's 50 mil and I thought I got the wrong thing. Nope! Works great. Did all four doors on my 93 civic and I have enough for the floor I think. Solid price. Noise reduced by about 5 decibels hive difference. Very sticky and easy to apply I'm so happy I was able to cover most all of my car. If I need more, definitely buying this since I got so much extra and I thought I would.
PS: that five decibel thing is only with the four doors. My firewall is next and then my floor, but it's such a huge difference
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 2, 2026
★★★★★ 5
Quiet your vehicle noises
Size: 50 sqft
Put this in our high roof van and couldn’t believe how much quieter it was at once. Really cut down on the vibration noise Nice and easy to install just peel n stick. Was also easy to cut with scissors for smaller areas. Seemed to be really nice quality. Didn’t notice any odor.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 9, 2026
★★★★★ 5
Sound deadening the Hot Rod
Size: 20 sqft, Size: 20 sqft
Works well, good value for the money.
It’s very sticky and conforms to what you are applying it to. One 20 sq ft box did approximately the passenger side
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 3, 2026