Thumpr 243/257 Hydraulic Flat Cam K-Kit for Chevrolet Big Block 396-454
| Kit Type |
K-Kit - Complete Kit |
| Camshaft Series |
Thumpr |
| Usage |
Street/Strip |
| Cam Type |
Hydraulic Flat Tappet |
| Basic Operating RPM Range |
2,300-6,200 |
| Intake Duration at .050 Inch Lift |
243 |
| Exhaust Duration at .050 inch Lift |
257 |
| Advertised Intake Duration |
295 |
| Advertised Exhaust Duration |
313 |
| Lobe Separation |
107 |
| Intake Valve Lift |
0.522 |
| Exhaust Valve Lift |
0.507 |
| Lifters Included |
Yes |
| Valve Springs Included |
Yes |
| Assembly Lubricant Included |
Yes |
| Camshaft Gear Attachment |
3-Bolt |
| Camshaft Material |
Cast Iron |
| Lifter Type |
Hydraulic Flat Tappet |
| Gaskets Included |
No |
| Engine Family |
Chevrolet 396-454 c.i. 8 Cylinder (1967-1996) |
| California Proposition 65 |
WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov |
| Title |
Thumpr 243/257 Hydraulic Flat Cam K-Kit for Chevrolet Big Block 396-454 |
| Amazon ASIN |
B001S1QY6Y |
| 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. 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 California Certified Vehicles Manufactured Before 1965? |
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. Exemption Reason |
N/A |
| C.A.R.B. E.O. Number |
N/A |
| Description_MKT |
K-KIT - Complete Kit Includes: Camshaft |
| Description_MKT |
Lifters |
| Description_MKT |
Valve Springs |
| Description_MKT |
Retainers |
| Description_MKT |
Valve Locks |
| Description_MKT |
Valve Stem Seals |
| Description_MKT |
Timing Chain Set |
| Description_MKT |
Assembly Lube (in flat tappet applications) |
| Description_MKT |
Decals and Instructions. |
| Description_DEF |
Engine Camshaft Kit |
| Description_SHO |
Engine Camshaft Kit |
| Description_INV |
Thumpr 243/257 H-Flat K-Kit BBC 396-454 |
| Description_KSW |
Chevelle |
| Description_KSW |
Camaro |
| Description_KSW |
Corvette |
| Description_KSW |
Stingray |
| Description_KSW |
Silverado |
| Description_KSW |
C10 |
| Description_KSW |
Firebird |
| Description_KSW |
Chevrolet |
| Description_KSW |
Big Block |
| Description_KSW |
Chevy |
| Description_KSW |
BBC |
| Description_KSW |
454 |
| Description_KSW |
427 |
| Description_KSW |
502 |
| Description_KSW |
396 |
| Description_KSW |
Caprice |
| Description_KSW |
Malibu |
| Description_KSW |
Impala |
| Description_KSW |
Nova |
| Description_KSW |
Monte Carlo |
| Description_KSW |
S10 |
| Description_KSW |
572 |
| Description_DES |
Thumpr 243/257 Hydraulic Flat Cam K-Kit for Chevrolet Big Block 396-454 |
| Description_APS |
Chevrolet GEN IV 396-454 Big Block Engines Originally Equipped with Flat Tappet Camshafts |
| Description_EXT |
Street/strip |
| Description_EXT |
needs 9.5:1 compression |
| Description_EXT |
2800+ stall |
| Description_EXT |
intake |
| Description_EXT |
gears and headers |
| Description_EXT |
very rough idle. |
