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 | N/A |
| Assembly Lubricant Included | No |
| Basic Operating RPM Range | 2,300-6,100 |
| 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 | CL51-602-11 |
| Cam Type | Hydraulic Roller |
| Camshaft Gear Attachment | 1-Bolt |
| Camshaft Material | Billet Steel |
| Camshaft Series | Thumpr |
| Description_ASM | Pontiac 265-455 V8 |
| Description_DEF | Engine Camshaft |
| Description_DES | Big Mutha’ Thumpr 243/257 Hydraulic Roller Cam for Pontiac 265-455 |
| Description_EXT | Street/strip, needs 9.5:1 compression, 2800+ stall, intake, gears and headers, very rough idle. |
| Description_INV | BMThmpr 243/257 H-Rlr Pontiac 265-455 |
| Description_KEY | 265 |
| Description_KEY | 287 |
| Description_KEY | 301 |
| Description_KEY | 317 |
| Description_KEY | 347 |
| Description_KEY | 350 |
| Description_KEY | 370 |
| Description_KEY | 389 |
| Description_KEY | 400 |
| Description_KEY | 421 |
| Description_KEY | 428 |
| Description_KEY | 455 |
| Description_KEY | 455 HO |
| Description_KEY | Bonneville |
| Description_KEY | Catalina |
| Description_KEY | Century |
| Description_KEY | Firebird |
| Description_KEY | Formula |
| Description_KEY | Grand Am |
| Description_KEY | Grand Prix |
| Description_KEY | HO |
| Description_KEY | LeMans |
| Description_KEY | Parisienne |
| Description_KEY | Pontiac |
| Description_KEY | Ram Air |
| Description_KEY | Ram Air III |
| Description_KEY | Ram Air IV |
| Description_KEY | Regal |
| Description_KEY | SD |
| Description_KEY | SD455 |
| Description_KEY | Super Duty |
| Description_KEY | Trans-Am |
| Description_SHO | BMT 243/257 HRlrPont |
| Description_SHP | None |
| Engine Family | Pontiac 265-455 C.I. 8 Cylinder (1955-1981) |
| Exhaust Duration at .050 inch Lift | 257 |
| Exhaust Valve Lift | 0.519 |
| Grind Number | 299THR7 |
| height | 2.75 |
| Intake Duration at .050 Inch Lift | 243 |
| Intake Valve Lift | 0.532 |
| K-Kit Upgrade | K51-602-11 |
| length | 24.5 |
| Lifter Type | Hydraulic Roller |
| Lifters Included | No |
| Lobe Separation | 107 |
| LTL | N |
| Title | Big Mutha’ Thumpr 243/257 Hydraulic Roller for Pontiac 265-455 |
| Usage | Street/Strip |
| Valve Springs Required | Yes |
| weight | 8.7 |
| width | 3.0 |
Explore more from our collection.
Reviews
There are no reviews yet.