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COMP Cams 12-678-4 Xtreme Energy Solid Flat Tappet Camshaft Chevrolet Small Block - 244/252

(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 + 244 more models)

Part of: COMP Cams Xtreme Energy Solid Flat Tappet Camshaft Chevrolet Small Block

Other options in this family: COMP Cams 12-675-4

Manufacturer

Picture for manufacturer COMP Cams

Part Number

12-678-4
5 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 12-678-4 is a high-performance solid flat tappet camshaft designed specifically for Chevrolet Small Block engines. This camshaft features aggressive 244/252 duration specs that deliver excellent mid-range to top-end power, making it ideal for street/strip applications and performance enthusiasts seeking substantial horsepower gains.

Camshaft Specifications:

  • Advertised Duration: 284°/292° intake/exhaust
  • Duration at .050": 244°/252° intake/exhaust
  • Valve Lift (with 1.5 ratio): .510"/.520" intake/exhaust
  • Lobe Separation Angle: 110°
  • Recommended RPM Range: 2,500-6,500 RPM
  • Solid flat tappet design for maximum durability

Key Features:

  • Xtreme Energy lobe profiles optimize performance across the powerband
  • Provides aggressive sound and noticeable performance increase
  • Requires aftermarket valve springs and may require cylinder head machining
  • Best suited for engines with compression ratios of 9.5:1 or higher
  • Compatible with stock or aftermarket cylinder heads
  • Designed for manual transmission applications or high-stall automatic converters (2,800+ RPM)

This camshaft is engineered for performance-minded builders looking to extract maximum power from their small block Chevy. Professional installation and proper break-in procedures are essential for solid flat tappet camshafts to ensure optimal performance and longevity.

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 + 241 more models

Advertised Intake Duration

282

Basic Operating RPM Range

2,400-6,800

Grind Number

XS282S

Lifter Type

Solid Flat Tappet

Intake Valve Lift

0.52

Intake Duration at .050 Inch Lift

244

Exhaust Duration at .050 inch Lift

252

Camshaft Material

Cast Iron

Cam and Lifter Kit Upgrade

CL12-678-4

K-Kit Upgrade

K12-678-4

SK-Kit Upgrade

SK12-678-4

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.

Camshaft Gear Attachment

3-Bolt

Exhaust Valve Lift

0.54

AMAZON ASIN

B000R9Z63K

Advertised Exhaust Duration

290

Engine Family

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

Camshaft Series

Xtreme Energy

Great Price on products and Shipping

Fast shipping, Good communication, Highly recommended.!!!

The best prices on the net.

quick delivery of the parts I need to fix my jeep

Web site was confusing as to which part I needed but sales guy on phone got me hooked up with the correct part number so I could get the desired part. Order was shipped next day. Thank You.

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