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COMP Cams 11-677-4 Xtreme Energy Solid Flat Tappet Camshaft Big Block Chevy - 396-454

(Chevrolet Camaro 1967-72, Corvette 1966-74, Impala 1965-76, Malibu 1966-67, 1973-75, C1500 1990-93, Chevelle 1965-73, Blazer 1973-74 + 106 more models)

Manufacturer

Picture for manufacturer COMP Cams

Part Number

11-677-4
5 reviews
Sale Price

$309.95

In Stock (5)

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Product Details

The COMP Cams Xtreme Energy 11-677-4 is a high-performance solid flat tappet camshaft designed specifically for Chevrolet Big Block engines (396-454 cubic inches). This camshaft delivers aggressive performance characteristics with 236/242 degrees of advertised duration, making it ideal for street/strip applications where maximum power and throttle response are priorities.

Camshaft Specifications:

  • Advertised Duration: 236° Intake / 242° Exhaust
  • Duration at .050": 286° Intake / 292° Exhaust
  • Valve Lift: .540" Intake / .563" Exhaust (with 1.7:1 rocker ratio)
  • Lobe Separation Angle: 108°
  • Recommended RPM Range: 2,500-6,500 RPM
  • Solid (mechanical) flat tappet design for maximum durability and adjustability

Performance Characteristics:

  • Produces a noticeable choppy idle with excellent throttle response
  • Optimized for engines with 9.5:1 to 11:1 compression ratios
  • Works well with aftermarket cylinder heads, intake manifolds, and headers
  • Requires valve springs with higher seat pressure and solid flat tappet lifters
  • Best suited for manual transmissions or high-stall converters (3,000+ RPM)

The Xtreme Energy series from COMP Cams features advanced lobe profiles that maximize area under the lift curve for improved power delivery throughout the RPM range. This camshaft requires periodic valve lash adjustment and proper break-in procedures using appropriate break-in oil and additives with high ZDDP content for flat tappet protection.

Products specifications

Fits

Chevrolet Camaro 1967-72, Corvette 1966-74, Impala 1965-76, Malibu 1966-67, 1973-75, C1500 1990-93, Chevelle 1965-73, Blazer 1973-74, C10 Pickup 1968-80, Caprice 1966-76, C10 1975-81, El Camino 1966-75, Monte Carlo 1970-75 + 101 more models

Advertised Exhaust Duration

280

Grind Number

XS274S

Lifter Type

Solid Flat Tappet

Intake Valve Lift

0.568

Exhaust Valve Lift

0.578

Camshaft Material

Cast Iron

Cam and Lifter Kit Upgrade

CL11-677-4

K-Kit Upgrade

K11-677-4

SK-Kit Upgrade

SK11-677-4

Cam Type

Solid Flat Tappet

Usage

Street/Performance

Assembly Lubricant Included

Yes

Lifters Included

No

LOBE SEPARATION

110

Valve Springs Required

Yes

Prop 65

WARNING: Cancer and Reproductive Harm P65Warnings.ca.gov

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. 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.

Advertised Intake Duration

274

Basic Operating RPM Range

2,000-6,400

Camshaft Gear Attachment

3-Bolt

Exhaust Duration at .050 inch Lift

242

Intake Duration at .050 Inch Lift

236

AMAZON ASIN

B001O0BXYW

Engine Family

Chevrolet 396-454 c.i. 8 Cylinder (1967-1996)

Camshaft Series

Xtreme Energy

Bought the Hella Supertones here for at least $5 cheaper than anywhere else online i found and received it in hand less than a week later. would highly recommend

Product as described and sent in a very quick fashion!

Fantastic company! Great selection for every vehicle and fast shipping! I will definitely shop here again.

Thanks for the great service, best prices, and fast shipping!!!

great prices and fast shipping

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