Xtreme Energy Mechanical Roller Camshaft Complete Kit Big Block Chevy 1965-96 Lift: .639"/.646"

Vehicle Info Needed

COMP CAMSPART NUMBER: 249-K11-770-8

Xtreme Energy Mechanical Roller Camshaft Complete Kit Big Block Chevy 1965-96 Lift: .639"/.646"

Name: Xtreme Energy Mechanical Roller Camshaft Complete Kit Big Block Chevy 1965-96 Lift: .639"/.646"
Brand: COMP CAMS
SKU: 249-K11-770-8
Price: 1639.95 USD
Availability: InStock

^$1,639⁹⁵

Ships on 09/15/2026

Lowest Price Guarantee

Chevy 396-454ci Big Block 1965-96

Lift: .639"/.646"
Duration: 274°/280°
Lobe Separation Angle: 110°
RPM Range: 2200-6200

Mechanical Roller-Great for Power Touring. Needs 2500 stall, easy on parts. Very reliable power. Rough idle.
Chevelle, Camaro, Corvette, Stingray, Silverado, C10, Firebird, Chevrolet, Big Block, Chevy, BBC, 454, 427, 502, 396, Caprice, Malibu, Impala, Nova, Monte Carlo, S10, 572

Great for Power Touring. Needs 2500+ stall, easy on parts. Very reliable power. Rough idle.

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART

Part TypeCamshaft Kit

BrandCOMP CAMS

Package Height5.4

Package Width10.4

Package Length25.3

Weight28.5 PG

Part CategoryPerformance Parts

Exh. Duration @ .050 In. (Deg)242

Cam StyleMechanical roller tappet

Grind NumberCB XR274 R-10

Exh. Duration Advertised (Deg)280

Locks IncludedYes

Engine Make/SizeChevy Big Block (396-454)

Retainers IncludedYes

Intake Valve Lift With Factory Rocker Arm Ratio (I0.639

Int. Duration @ .050 In. (Deg)236

Assembly Lubricant IncludedNo

Basic Operating Rpm Range2,200-6,200

Pushrods IncludedNo

Gaskets IncludedNo

Intake Valve Lash0.016 in (0.406 mm)

Rocker Arms IncludedNo

Intake Valve Lift0.639 in (16.231 mm)

Computer-Controlled CompatibleNo

Int. Duration Advertised (Deg)274

Lobe Separation (Deg)110

Rpm Range2200-6200

Lifter StyleMechanical roller

Advertised Duration274 int./280 exh.

Exhaust Valve Lift With Factory Rocker Arm Ratio (0.646

Valve Springs IncludedYes

UsageStreet/Performance

Valve Lift With Factory Rocker Arm Ratio0.639 int./0.646 exh.

QuantitySold as a kit

Valve Stem Seals IncludedYes

Exhaust Valve Lash0.018 in (0.457 mm)

Exhaust Valve Lift0.646 in (16.408 mm)

Advertised Intake Duration274

Outside Diameter Of Outer Spring1.535 in (39 mm)

Intake Duration At 050 Inch Lift236

Exhaust Duration At 050 Inch Lift242

Timing Chain StyleDouble non-roller

Timing Chain And Gears IncludedYes

Advertised Exhaust Duration280

Lifter TypeMechanical Roller

Part FitmentSemi Universal

Duration At 050 Inch Lift236 int./242 exh.

Valve Springs RequiredNo

Lifters IncludedYes

Vendor Part NumberK11-770-8

Package Qty1

Package TypeEA

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