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COMP Cams 12-677-4 Xtreme Energy Solid Flat Tappet Camshaft - 236/242

(GMC G2500 1979-95, Yukon 1992-95, K1500 1979-86, 1988-95, C1500 1979-86, 1988-95, K2500 1979-86, 1988-95, Jimmy 1970-91 + 242 more models)

Part of: COMP Cams Xtreme Energy Solid Flat Tappet Camshaft Chrysler

Other options in this family: COMP Cams 12-676-4 COMP Cams 23-232-4 COMP Cams 12-674-4 COMP Cams 23-233-4 COMP Cams 23-230-4

Manufacturer

Picture for manufacturer COMP Cams

Part Number

12-677-4
6 reviews
Sale Price

$309.95

In Stock (10+)

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Usually delivered within 2 days

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Product Details

The COMP Cams Xtreme Energy 12-677-4 is a solid flat tappet camshaft engineered for Chevrolet small block engines seeking aggressive performance with maintained street manners. This camshaft features a 236/242 duration profile that delivers a quicker valve opening rate compared to traditional grinds, maximizing the area under the lift curve for improved cylinder filling and enhanced throttle response.

Key Features:

  • Solid flat tappet design for high-rpm durability and precise valve control
  • 236/242 advertised duration provides aggressive performance characteristics
  • Xtreme Energy profile optimizes valve timing for increased torque and horsepower
  • Maintains sufficient vacuum for power brakes and vacuum-dependent accessories
  • Excellent street/strip performance balance without sacrificing driveability
  • Quick-opening valve events improve engine responsiveness throughout the RPM range

This camshaft is ideal for performance street engines and weekend bracket racers. It works effectively in carbureted applications and delivers optimal results when paired with aftermarket intake manifolds, headers, free-flowing exhaust systems, and lower gear ratios. The Xtreme Energy grind family is designed for enthusiasts who want substantial performance gains while retaining the creature comforts necessary for reliable street driving.

Products specifications

Fits

GMC G2500 1979-95, Yukon 1992-95, K1500 1979-86, 1988-95, C1500 1979-86, 1988-95, K2500 1979-86, 1988-95, Jimmy 1970-91, C3500 1979-86, 1988-95, K2500 Suburban 1979-86, 1992-95, K3500 1979-86, 1988-95 + 239 more models

Advertised Exhaust Duration

280

Grind Number

XS274S

Lifter Type

Solid Flat Tappet

Exhaust Valve Lift

0.51

Intake Valve Lift

0.501

Camshaft Material

Cast Iron

Cam and Lifter Kit Upgrade

CL12-677-4

K-Kit Upgrade

K12-677-4

SK-Kit Upgrade

SK12-677-4

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

B001NN90FO

Engine Family

Chevrolet 262-400 c.i. 8 Cylinder (1958-1998)

Camshaft Series

Xtreme Energy

Overall good. Item discription a little vague.

First time shopper, Great

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