| Description_ASM |
1996-1999 Chevrolet 454/502 GEN VI Big Block |
| Description_DEF |
Engine Camshaft |
| Description_EXT |
Street/strip, needs 9.5:1 compression, 2800+ stall, intake, gears and headers, very rough idle. |
| Description_DES |
Big Mutha' Thumpr 243/257 Hydraulic Roller Cam for Chevrolet Big Block GEN VI |
| Description_KEY |
Chevelle, Camaro, Corvette, Stingray, Silverado, C10, Firebird, Chevrolet, Big Block, Chevy, BBC, 454, 427, 502, 396, Caprice, Malibu, Impala, Nova, Monte Carlo, S10, 572 |
| Description_SHO |
BMT 243/257 HRlrBBC6 |
| Description_INV |
BM-Thmpr 243/257 H-Roller Cam BBC GEN VI |
| 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_SHP |
None |
| Camshaft Series |
Thumpr |
| Lifter Type |
Hydraulic Roller |
| Engine Family |
Chevrolet GEN VI 454 and 502 c.i. 8 Cylinder (1996-1999) |
| Lifters Included |
No |
| C.A.R.B. Exempt for California Certified Vehicles Manufactured Before 1965? |
Yes, but must meet tailpipe emission standards for year of vehicle. |
| Assembly Lubricant Included |
No |
| California Proposition 65 |
WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov |
| Lobe Separation |
107 |
| Title |
Big Mutha' Thumpr 243/257 Hydraulic Roller Cam for Chevrolet Big Block GEN VI |
| Camshaft Material |
Austempered Ductile Iron |
| Usage |
Street/Strip |
| Intake Duration at .050 Inch Lift |
243 |
| K-Kit Upgrade |
K01-602-8 |
| Exhaust Valve Lift |
0.554 |
| Advertised Intake Duration |
299 |
| Exhaust Duration at .050 inch Lift |
257 |
| C.A.R.B. E.O. Number |
N/A |
| Valve Springs Required |
Yes |
| Advertised Exhaust Duration |
319 |
| C.A.R.B. Exempt for Racing and Off-Road Only Vehicles? |
Yes, but must be a race/competition only vehicle. |
| Basic Operating RPM Range |
2,500-6,200 |
| Intake Valve Lift |
0.569 |
| C.A.R.B. Exemption Reason |
N/A |
| C.A.R.B. Exempt for Foreign Vehicles Manufactured Before 1967? |
Yes, but must meet tailpipe emission standards for year of vehicle. |
| Camshaft Gear Attachment |
3-Bolt |
| C.A.R.B. Exempt for Federally Certified Vehicles Manufactured Before 1967? |
Yes, but must meet tailpipe emission standards for year of vehicle. |
| Cam Type |
Hydraulic Roller |
| Cam and Lifter Kit Upgrade |
CL01-602-8 |
| Amazon ASIN |
B005H89P7O |
| C.A.R.B. Exempt for On-Road Vehicles? |
No |
| Grind Number |
299THR7 |
| Length |
3.0000 |
| Width |
3.0000 |
| Height |
24.0000 |
| Weight |
11.0000 |
