COMP Cams Big Mutha" Thumpr Hydraulic Flat Tappet Camshaft and Lifter Kit Lift .500"/.486" Duration 295/313 RPM Range 2500 to 6400
249-CL12-602-4

Items You Need
Chevy 262-400ci Small Block 1958-98
265, 283, 307, 302, 305, 327, 350, 383, 400, 427, L46, L48, L65, LM1, LT-1, L82, L81, LS9, L83, L98, L05, LG3, LG4, LT1, LT4, Camaro, Corvette, Chevelle, Stingray, Silverado, C10, Firebird, Chevrolet, Chevy, Small Block Chevy, Caprice, Malibu, Impala, Nova, 355, GEN1, Monte Carlo, S10
Street/strip, needs 9.5:1 compression, 2800+ stall, intake, gears and headers, very rough idle.
Specifications:
Thumpr Camshafts are the hottest cams to hit the streets in more than a decade. That's because they give you the big cam sound you're looking for, without the drawbacks. Applying a camshaft design originally created for sports car endurance racing, they incorporate early exhaust valve opening, long exhaust duration, and a generous amount of intake and exhaust overlap. Best of all, Thumprs will not negatively impact power output or streetability.
Features:![]() Thumpr Sound Clip ![]() |
Camshaft & Lifter Kits are indicated by a CL in their part number and include Camshaft, Lifters, Assembly Lube, Decals, and Instructions.
Complete Kits are indicated by a K in their part number and include Camshaft, Lifters, Timing Chain & Gears, Valve Springs, Retainers, Locks, Assembly Lube, Decals, and Instructions.
Does COMP Cams CL12-602-4 fit your vehicle?
1980 CHEVROLET K20
- Liter: 6.6
- SubModel: CUSTOM DELUXE
- Aspiration: NATURALLY ASPIRATED
- CUI: 400
- Engine Type: V8 ( 6.6L / 400 )
- Engine Vin: X
1973 CHEVROLET G20 VAN
- Liter: 7.4
- SubModel: BASE
- Aspiration: NATURALLY ASPIRATED
- CUI: 454
- Engine Type: V8 ( 7.4L / 454 )
- Engine Vin: Z
1978 GMC K25 SUBURBAN
- Liter: 5
- SubModel: HIGH SIERRA
- Aspiration: NATURALLY ASPIRATED
- CUI: 305
- Engine Type: V8 ( 5L / 305 )
- Engine Vin: U
1977 OLDSMOBILE OMEGA
- Liter: 5.7
- SubModel: DELUXE
- Aspiration: NATURALLY ASPIRATED
- CUI: 350
- Engine Type: V8 ( 5.7L / 350 )
- Engine Vin: L
1971 GMC G25/G2500 VAN
- Liter: 4.1
- SubModel: VANDURA
- Aspiration: NATURALLY ASPIRATED
- CUI: 250
- Engine Type: L6 ( 4.1L / 250 )
- Engine Vin: C
1984 GMC C1500 SUBURBAN
- Liter: 5.7
- SubModel: BASE
- Aspiration: NATURALLY ASPIRATED
- CUI: 350
- Engine Type: V8 ( 5.7L / 350 )
- Engine Vin: Z
1971 GMC G35/G3500 VAN
- Liter: 5.7
- SubModel: VANDURA
- Aspiration: NATURALLY ASPIRATED
- CUI: 350
- Engine Type: V8 ( 5.7L / 350 )
- Engine Vin: -
1969 CHEVROLET K20 PICKUP
- Liter: 5
- SubModel: BASE
- Aspiration: NATURALLY ASPIRATED
- CUI: 307
- Engine Type: V8 ( 5L / 307 )
- Engine Vin: E
1983 GMC G3500
- Liter: 5.7
- SubModel: RALLY CAMPER SPECIAL
- Aspiration: NATURALLY ASPIRATED
- CUI: 350
- Engine Type: V8 ( 5.7L / 350 )
- Engine Vin: M
1980 GMC C2500
- Liter: 4.8
- SubModel: SIERRA GRANDE
- Aspiration: NATURALLY ASPIRATED
- CUI: 292
- Engine Type: L6 ( 4.8L / 292 )
- Engine Vin: T
1985 GMC G3500
- Liter: 5.7
- SubModel: RALLY STX
- Aspiration: NATURALLY ASPIRATED
- CUI: 350
- Engine Type: V8 ( 5.7L / 350 )
- Engine Vin: M
1980 PONTIAC FIREBIRD
- Liter: 4.3
- SubModel: ESPRIT
- Aspiration: NATURALLY ASPIRATED
- CUI: 265
- Engine Type: V8 ( 4.3L / 265 )
- Engine Vin: S
will this cam work with stock lifters and push rods
Will this fit a 84 Camaro Birlinetta with a crate 350 replacement from the stock engine?
Will this fit with a 96 camaro z28 LT1
Will stock heads work with this cam for the valve clearance
Motor Vehicles
WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.
Tools:
WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.
Electrical Cords
WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.