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COMP Cams 12-657-5 Oval Track 256/262 Solid Flat Tappet Camshaft for Chevy Small Block

(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 + 240 more models)

Part of: COMP Cams Oval Track Solid Flat Tappet Camshaft Chevy Small Block

Other options in this family: COMP Cams 12-610-5 COMP Cams 12-652-5 COMP Cams 12-650-5 COMP Cams 12-608-5 COMP Cams 12-645-5

Manufacturer

Picture for manufacturer COMP Cams

Part Number

12-657-5
6 reviews
Sale Price

$325.95

1 left at this price

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Usually delivered within 2 days

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Product Details

The COMP Cams 12-657-5 is a high-performance solid flat tappet camshaft specifically designed for oval track racing applications in Chevrolet small block engines. This camshaft features an aggressive profile with 256 degrees of advertised intake duration and 262 degrees of advertised exhaust duration, delivering strong mid-range to upper RPM power for competitive circle track performance.

Key Specifications:

  • Advertised Duration: 256° intake / 262° exhaust
  • Duration at .050": 212° intake / 218° exhaust
  • Valve Lift: .454" intake / .474" exhaust (with 1.5:1 rocker ratio)
  • Lobe Separation Angle: 110°
  • Solid flat tappet design for precise valve control
  • Optimized for 2500-6500 RPM operating range

Performance Features:

  • Aggressive split-duration profile for enhanced exhaust scavenging
  • Tight lobe separation angle maximizes torque and throttle response
  • Designed for oval track and circle track racing environments
  • Requires compatible solid flat tappet lifters, dual valve springs, and hardened pushrods
  • Best suited for engines with compression ratios of 10.0:1 or higher

This camshaft is ideal for dedicated racing engines where maximum performance within the oval track RPM range is critical. Proper break-in procedures with zinc-enhanced oil are essential for solid flat tappet camshafts to ensure longevity and prevent premature wear.

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, C15/C1500 Pickup 1967-74 + 236 more models

Advertised Intake Duration

286

Basic Operating RPM Range

3,200-6,900

Usage

Strip

Lifter Type

Solid Flat Tappet

Intake Valve Lift

0.549

Intake Duration at .050 Inch Lift

256

Grind Number

286XO-6

Camshaft Material

Cast Iron

Cam Type

Solid Flat Tappet

Camshaft Series

Xtreme Oval

Assembly Lubricant Included

Yes

Lifters Included

No

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

LOBE SEPARATION

106

Advertised Exhaust Duration

296

Engine Family

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

Exhaust Valve Lift

0.543

Exhaust Duration at .050 inch Lift

262

AMAZON ASIN

B000P5D8FY

No issues. Confirmation that it fits my vehicle and paypal. Perfect

They had the lowest price and great communication. Will order from them again thanks

For as cheap as what I paid for my product I will admit I was scared!!! Got what I asked for in perfect condition, came fast and wonder where have you been all my shopping life? Thanx for such a great deal and fast shipping!!!

First time buyer

Unbeleiveable!!!! Super fast shipping!! Great job!!! Keep up the good work!<br><br>P Savaria

best price, cheap shipping, easy to order, thank you Order Number: 4829<br>

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