Description
Street/strip, needs 9.5:1 compression, 2800+ stall, intake, gears and headers, very rough idle.
Resources
Installation Instructions
Resources
Installation Instructions
Specifications:
| Advertised Exhaust Duration | 319 |
| Advertised Intake Duration | 299 |
| Amazon ASIN | B000V9GBUS |
| Assembly Lubricant Included | No |
| Basic Operating RPM Range | 2,500-6,200 |
| 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 and Lifter Kit Upgrade | CL12-602-8 |
| Cam Type | Hydraulic Roller |
| Camshaft Gear Attachment | 3-Bolt |
| Camshaft Material | Austempered Ductile 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 |
| Description_DES | Big Mutha’ Thumpr 243/257 Hydraulic Roller Cam for Chevrolet Small Block |
| Description_EXT | Street/strip, needs 9.5:1 compression, 2800+ stall, intake, gears and headers, very rough idle. |
| Description_INV | Big M-Thumpr 243/257 Hyd Roller Cam 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_SHO | BMT 243/257 HRlr SBC |
| Description_SHP | None |
| Description_TRA | Warning: Camshaft Optimized for use with a Melanized or Nitrided distributor gear. Not compatible with cast or steel gears without similar surface treatments. Failure to utilize the proper distributor gear will void all warranties and/or return policies |
| Engine Family | Chevrolet 262-400 c.i. 8 Cylinder (1958-1998) |
| Exhaust Duration at .050 inch Lift | 257 |
| Exhaust Valve Lift | 0.517 |
| Grind Number | 299THR7 |
| height | 2.7 |
| Intake Duration at .050 Inch Lift | 243 |
| Intake Valve Lift | 0.531 |
| K-Kit Upgrade | K12-602-8 |
| length | 24.2 |
| Lifter Type | Hydraulic Roller |
| Lifters Included | No |
| Lobe Separation | 107 |
| LTL | N |
| Title | Big Mutha’ Thumpr 243/257 Hydraulic Roller Cam for Chevrolet Small Block |
| Usage | Street/Strip |
| Valve Springs Required | Yes |
| weight | 8.774 |
| width | 2.9 |
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