Description
High performance street/strip, needs 9:1 compression, 2500+ stall, intake, gears and headers, rough idle.
Resources
Installation Instructions
Resources
Installation Instructions
Specifications:
| Advertised Exhaust Duration | 305 |
| Advertised Intake Duration | 287 |
| Amazon ASIN | B002EE2ZDK |
| Assembly Lubricant Included | Yes |
| Basic Operating RPM Range | 2,200-6,100 |
| C.A.R.B. E.O. Number | N/A |
| C.A.R.B. Exempt for California Certified Vehicles Manufactured Before 1965? | Yes, but must meet tailpipe emission standards for year of vehicle. |
| C.A.R.B. Exempt for Federally Certified Vehicles Manufactured Before 1967? | Yes, but must meet tailpipe emission standards for year of vehicle. |
| 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 P65Warnings.ca.gov |
| Cam Type | Hydraulic Flat Tappet |
| Camshaft Gear Attachment | 3-Bolt |
| Camshaft Material | Cast Iron |
| Camshaft Series | Thumpr |
| Description_ASM | Fits Chevrolet GEN 1 Small Blocks including the 262, 265, 267, 283, 302, 305, 307, 327, 350 and 400. Does not fit LT1/LT4, or factory roller Small Blocks built from 1985 and newer. GM gradually added roller camshafts to 305’s and 350’s from the mid 80’s forward. Camaros/Firebirds/Corvettes received the roller cams early, but many trucks and SUV’s had flat tappet cams until the mid 90’s. Remove the intake or timing cover to confirm whether the block is a factory roller or flat tappet. Does not fit the LS1, LS2, LS3 or any LS-based 4.8, 5.3, 5.7, 6.0 and 6.2. 1955-1957 Chevrolet 265 engines require a groove on the 5th cam journal for oiling. Contact us for more information. |
| Description_DEF | Engine Camshaft and Lifter Kit |
| Description_DES | High Energy Hydraulic Flat Lifter Set for Chevrolet Small and Big Block. |
| Description_DES | Mutha’ Thumpr 235/249 Hydraulic Flat Cam and Lifter Kit Chevrolet Small Block |
| Description_DES | Mutha’ Thumpr 235/249 Hydraulic Flat Cam for Chevrolet Small Block |
| Description_EXT | High performance street/strip, needs 9:1 compression, 2500+ stall, intake, gears and headers, rough idle. |
| Description_INV | M-Thumpr 235/249 Hyd Flat CL-Kit SBC |
| Description_KEY | 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 |
| Description_MKT | CL-KIT – Cam and Lifter Kit Includes: Camshaft, Lifters, Assembly Lube, Decals and Instructions. |
| Description_SHO | Camshaft, Lifter Kt |
| Description_SHP | None |
| Engine Family | Chevrolet 262-400 c.i. 8 Cylinder (1958-1998) |
| Exhaust Duration at .050 inch Lift | 249 |
| Exhaust Valve Lift | 0.476 |
| Gaskets Included | No |
| height | 3.0 |
| Intake Duration at .050 Inch Lift | 235 |
| Intake Valve Lift | 0.489 |
| K-Kit Upgrade | K12-601-4 |
| Kit Type | CL-Kit – Cam and Lifter Kit |
| length | 25.4 |
| Lifter Type | Hydraulic Flat Tappet |
| Lifters Included | Yes |
| Lobe Separation | 107 |
| Locks Included | No |
| LTL | N |
| Retainers Included | No |
| SK-Kit Upgrade | GK12-601-4 |
| Timing Chain and Gears Included | No |
| Title | Mutha’ Thumpr 235/249 Hydraulic Flat Cam and Lifter Kit Chevrolet Small Block |
| Usage | Street/Strip |
| Valve Springs Required | Yes |
| Valve Stem Seals Included | No |
| weight | 13.05 |
| width | 5.5 |
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