| Advertised Exhaust Duration |
311 |
| Advertised Intake Duration |
291 |
| Amazon ASIN |
B002EDZVUU |
| Assembly Lubricant Included |
No |
| Basic Operating RPM Range |
1,900-5,600 |
| 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 |
CL08-601-8 |
| Cam Type |
Hydraulic Roller |
| Camshaft Gear Attachment |
3-Bolt |
| Camshaft Material |
Austempered Ductile Iron |
| Camshaft Series |
Thumpr |
| Description_ASM |
Fits '87 GEN 1 Chevrolet 305-350 Small Blocks w/ Factory Roller Camshafts (Not LT-1/LS1 etc) |
| Description_DEF |
Engine Camshaft |
| Description_DES |
Mutha' Thumpr 235/249 Hydraulic Roller Cam for OE Roller SBC |
| Description_EXT |
High performance street/strip, needs 9:1 compression, 2500 stall, intake, gears and headers, rough idle. |
| Description_INV |
M-Thmpr 235/249 H-Rolr Cam OE Roller 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 |
MT 235/249 HRlrSBC |
| Description_SHP |
None |
| Engine Family |
Chevrolet 305-350 c.i. 8 Cylinder O.E. Roller (1987-1998) |
| Exhaust Duration at .050 inch Lift |
249 |
| Exhaust Valve Lift |
0.509 |
| Grind Number |
291THR7 |
| height |
2.59 |
| Intake Duration at .050 Inch Lift |
235 |
| Intake Valve Lift |
0.522 |
| K-Kit Upgrade |
K08-601-8 |
| length |
23.22 |
| Lifter Type |
Hydraulic Roller |
| Lifters Included |
No |
| Lobe Separation |
107 |
| LTL |
N |
| Title |
Mutha' Thumpr 235/249 Hydraulic Roller Cam for OE Roller SBC |
| Usage |
Street/Strip |
| Valve Springs Required |
Yes |
| weight |
8.65 |
| width |
2.83 |
