Thumpr NIT 235/249 Hydraulic Flat Cam For Chevrolet Big Block 396-454

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. Vehicle Specific

• Chevrolet GEN IV 396-454 Big Block Engines Originally Equipped with Flat Tappet Camshafts

Attributes:

• Brand Name: COMP Cams
• GTIN: 00036584177852
• Advertised Exhaust Duration: 304
• Advertised Intake Duration: 287
• Amazon ASIN: B002EE6GF8
• Assembly Lubricant Included: Yes
• Basic Operating RPM Range: 2,000-5,900
• 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
• Cam Type: Hydraulic Flat Tappet
• Camshaft Gear Attachment: 3-Bolt
• Camshaft Material: Nitrided Cast Iron
• Camshaft Series: Thumpr
• Engine Family: Chevrolet 396-454 c.i. 8 Cylinder (1967-1996)
• Exhaust Duration at .050 inch Lift: 249
• Exhaust Valve Lift: 0.495
• Grind Number: 287TH7
• Intake Duration at .050 Inch Lift: 235
• Intake Valve Lift: 0.51
• Lifter Type: Hydraulic Flat Tappet
• Lifters Included: No
• Lobe Separation: 107
• Usage: Street/Strip
• Valve Springs Required: Yes

Extended Information:

• Country of Origin: United States
• Emissions : EPA Eligible

Packing Information:

• Quantity of Each: 1
• Package UOM: EA
• Dimension: 23.38 x 2.83 x 2.59 inches
• Weight: 10.65 POUNDS