COMP Cams Thumpr Hydraulic Flat Tappet Camshaft Pro-Plasma Nitrided Lift .498"/.483" Duration 279/297 RPM Range 1800 to 5600
249-12-600-20

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
High performance street, stock converter ok, best with 2000+ converter and gears. Choppy/thumping idle. Nitrided.
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 12-600-20 fit your vehicle?
1955 CHEVROLET BEL AIR
- Liter: 4.3
- SubModel: BEAUVILLE
- Aspiration: NATURALLY ASPIRATED
- CUI: 265
- Engine Type: V8 ( 4.3L / 265 )
- Engine Vin: -
1971 CHEVROLET C30 PICKUP
- Liter: 5.7
- SubModel: BASE
- Aspiration: NATURALLY ASPIRATED
- CUI: 350
- Engine Type: V8 ( 5.7L / 350 )
- Engine Vin: E
1973 CHEVROLET MALIBU
- Liter: 5.7
- SubModel: BASE
- Aspiration: NATURALLY ASPIRATED
- CUI: 350
- Engine Type: V8 ( 5.7L / 350 )
- Engine Vin: T
1989 GMC K2500
- Liter: 5.7
- SubModel: SIERRA SLX
- Aspiration: NATURALLY ASPIRATED
- CUI: 350
- Engine Type: V8 ( 5.7L / 350 )
- Engine Vin: K
1970 CHEVROLET BISCAYNE
- Liter: 5.7
- SubModel: BASE
- Aspiration: NATURALLY ASPIRATED
- CUI: 350
- Engine Type: V8 ( 5.7L / 350 )
- Engine Vin: -
1974 PONTIAC FIREBIRD
- Liter: 6.6
- SubModel: ESPRIT
- Aspiration: NATURALLY ASPIRATED
- CUI: 400
- Engine Type: V8 ( 6.6L / 400 )
- Engine Vin: T
1995 GMC C2500
- Liter: 5
- SubModel: SIERRA SLT
- Aspiration: NATURALLY ASPIRATED
- CUI: 305
- Engine Type: V8 ( 5L / 305 )
- Engine Vin: H
1982 GMC C2500
- Liter: 5
- SubModel: HIGH SIERRA
- Aspiration: NATURALLY ASPIRATED
- CUI: 305
- Engine Type: V8 ( 5L / 305 )
- Engine Vin: H
1981 CHEVROLET MALIBU
- Liter: 4.4
- SubModel: BASE
- Aspiration: NATURALLY ASPIRATED
- CUI: 267
- Engine Type: V8 ( 4.4L / 267 )
- Engine Vin: J
1970 CHEVROLET K20 SUBURBAN
- Liter: 5
- SubModel: BASE
- Aspiration: NATURALLY ASPIRATED
- CUI: 307
- Engine Type: V8 ( 5L / 307 )
- Engine Vin: A
1971 CHEVROLET MONTE CARLO
- Liter: 6.6
- SubModel: BASE
- Aspiration: NATURALLY ASPIRATED
- CUI: 402
- Engine Type: V8 ( 6.6L / 402 )
- Engine Vin: -
1995 GMC C2500 SUBURBAN
- Liter: 5.7
- SubModel: SLT
- Aspiration: NATURALLY ASPIRATED
- CUI: 350
- Engine Type: V8 ( 5.7L / 350 )
- Engine Vin: K
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