Description
Designed to deliver an aggressive, hard-hitting exhaust note at idle, the Thumpr camshaft series from COMP Cams also delivers excellent horsepower gains and a broad torque curve. A perfect choice for muscle cars and street rods, the Thumpr series’ early intake valve opening and long exhaust duration create optimum overlap for that race car idle. The Thumpr grinds all require an aftermarket torque converter and lower gear ratio to ensure the drivetrain always puts the engine in its powerband. Additionally, Thumpr camshafts typically deliver reduced vacuum at idle, making a vacuum canister, pump or hydroboost a requirement for vehicles running power brakes.
Resources
Installation Instructions
Resources
Installation Instructions
Specifications:
| Advertised Exhaust Duration | 297 |
| Advertised Intake Duration | 279 |
| Amazon ASIN | B002EDYKBQ |
| Assembly Lubricant Included | Yes |
| Basic Operating RPM Range | 2,000-5,800 |
| 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 | Nitrided 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 |
| Description_DES | Thumpr NIT 227/241 Hydraulic Flat Cam for Chevrolet Small Block |
| Description_EXT | High performance street, stock converter ok, best with 2000+ converter and gears. Choppy/thumping idle. Nitrided. |
| Description_INV | Thumpr NIT 227/241 H-Flt 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_MKT | Designed to deliver an aggressive, hard-hitting exhaust note at idle, the Thumpr camshaft series from COMP Cams also delivers excellent horsepower gains and a broad torque curve. A perfect choice for muscle cars and street rods, the Thumpr series’ early intake valve opening and long exhaust duration create optimum overlap for that race car idle. The Thumpr grinds all require an aftermarket torque converter and lower gear ratio to ensure the drivetrain always puts the engine in its powerband. Additionally, Thumpr camshafts typically deliver reduced vacuum at idle, making a vacuum canister, pump or hydroboost a requirement for vehicles running power brakes. |
| Description_SHO | T NIT 227/241 HFTSBC |
| Description_SHP | None |
| Engine Family | Chevrolet 262-400 c.i. 8 Cylinder (1958-1998) |
| Exhaust Duration at .050 inch Lift | 241 |
| Exhaust Valve Lift | 0.465 |
| Grind Number | 279TH7 |
| height | 2.75 |
| Intake Duration at .050 Inch Lift | 227 |
| Intake Valve Lift | 0.479 |
| length | 24.5 |
| Lifter Type | Hydraulic Flat Tappet |
| Lifters Included | No |
| Lobe Separation | 107 |
| LTL | N |
| Title | Thumpr NIT 227/241 Hydraulic Flat Cam for Chevrolet Small Block |
| Usage | Street/Strip |
| Valve Springs Required | Yes |
| weight | 8.64 |
| width | 3.0 |
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