| Advertised Exhaust Duration |
319 |
| Advertised Intake Duration |
299 |
| Amazon ASIN |
B005H89P7O |
| 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 |
CL01-602-8 |
| Cam Type |
Hydraulic Roller |
| Camshaft Gear Attachment |
3-Bolt |
| Camshaft Material |
Austempered Ductile Iron |
| Camshaft Series |
Thumpr |
| Description_ASM |
1996-1999 Chevrolet 454/502 GEN VI Big Block |
| Description_DEF |
Engine Camshaft |
| Description_DES |
Big Mutha' Thumpr 243/257 Hydraulic Roller Cam for Chevrolet Big Block GEN VI |
| Description_EXT |
Street/strip, needs 9.5:1 compression, 2800 stall, intake, gears and headers, very rough idle. |
| Description_INV |
BM-Thmpr 243/257 H-Roller Cam BBC 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_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 |
BMT 243/257 HRlrBBC6 |
| Description_SHP |
None |
| Engine Family |
Chevrolet GEN VI 454 and 502 c.i. 8 Cylinder (1996-1999) |
| Exhaust Duration at .050 inch Lift |
257 |
| Exhaust Valve Lift |
0.554 |
| Grind Number |
299THR7 |
| height |
2.6 |
| Intake Duration at .050 Inch Lift |
243 |
| Intake Valve Lift |
0.569 |
| K-Kit Upgrade |
K01-602-8 |
| length |
24.1 |
| Lifter Type |
Hydraulic Roller |
| Lifters Included |
No |
| Lobe Separation |
107 |
| LTL |
N |
| Title |
Big Mutha' Thumpr 243/257 Hydraulic Roller Cam for Chevrolet Big Block GEN VI |
| Usage |
Street/Strip |
| Valve Springs Required |
Yes |
| weight |
10.847 |
| width |
3.0 |
