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COMP Cams 12-246-20 Xtreme Energy XE274H Nitrided Hydraulic Flat Tappet Camshaft for Chevrolet Small Block

(GMC G2500 1979-95, Yukon 1992-95, K1500 1979-99, C1500 1979-99, K2500 1979-95, 1998, Jimmy 1970-91, Savana 2500 1996-2002 + 261 more models)

Manufacturer

Picture for manufacturer COMP Cams

Part Number

12-246-20
7 reviews
Sale Price

$468.95

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Product Details

The COMP Cams 12-246-20 is a pro-plasma nitrided version of the popular XE274H Xtreme Energy hydraulic flat tappet camshaft designed specifically for Chevrolet Generation 1 small block engines. This performance camshaft features an aggressive lobe profile that delivers strong mid-range torque and enhanced throttle response, making it ideal for street/strip applications.

Key Specifications:

  • Grind Number: XE274H-10
  • Advertised Duration: 274° intake / 286° exhaust
  • Duration at 0.050" Lift: 230° intake / 236° exhaust
  • Valve Lift (with 1.5 ratio rockers): 0.490" intake / 0.490" exhaust
  • Lobe Separation Angle: 110°
  • Operating RPM Range: 1,800-6,000
  • Cam Style: Hydraulic flat tappet
  • Surface Treatment: Pro-plasma nitrided for enhanced wear resistance

Performance Features:

  • Quicker opening lobe profiles deliver increased responsiveness and more area under the lift curve
  • Improved engine vacuum allows for increased duration while still supporting power brakes
  • Nitrided surface treatment provides superior durability and wear resistance compared to standard camshafts
  • Excellent performance in street carbureted applications
  • Very strong mid-range torque characteristics

Recommended Components:

  • Minimum 9.0:1 compression ratio recommended
  • 2,200+ RPM stall speed torque converter
  • Aftermarket valve springs required (not included)
  • Best performance with aftermarket intake manifold, headers, and lower gear ratios

Fitment: This camshaft fits Chevrolet GEN 1 small blocks including 262, 265, 267, 283, 302, 305, 307, 327, 350, and 400 cubic inch engines. Does not fit LT1/LT4 or factory roller small blocks built from 1985 and newer. Not compatible with LS-based engines.

Note: 1955-1957 Chevrolet 265 engines require a groove machined on the 5th cam journal for proper oiling. Valve springs upgrade is required for installation. Assembly lubricant should be used during installation.

Products specifications

Fits

GMC G2500 1979-95, Yukon 1992-95, K1500 1979-99, C1500 1979-99, K2500 1979-95, 1998, Jimmy 1970-91, Savana 2500 1996-2002, Savana 1500 1996-2002, C3500 1979-95, K2500 Suburban 1979-95, K3500 1979-95 + 257 more models

Basic Operating RPM Range

1,800-6,000

Cam Type

Hydraulic Flat Tappet

Exhaust Valve Lift

0.49

Camshaft Material

Nitrided Cast Iron

Assembly Lubricant Included

Yes

Lifters Included

No

LOBE SEPARATION

110

Valve Springs Required

Yes

Lifter Type

Hydraulic Flat Tappet

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

Camshaft Gear Attachment

3-Bolt

Exhaust Duration at .050 inch Lift

236

Intake Duration at .050 Inch Lift

230

Grind Number

XE274H

Advertised Exhaust Duration

286

Intake Valve Lift

0.49

Usage

Street/Strip

AMAZON ASIN

B002EE2G66

Engine Family

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

Camshaft Series

Xtreme Energy

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Easy and fast. Order arrived very fast. Thanks.

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