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COMP Cams 12-859-9 Oval Track Solid Roller Camshaft Chevy Small Block - 257/266

(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 + 238 more models)

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

Other options in this family: COMP Cams 12-857-9 COMP Cams 12-861-9 COMP Cams 12-911-9 COMP Cams 12-940-9 COMP Cams 12-996-9

Manufacturer

Picture for manufacturer COMP Cams

Part Number

12-859-9
4 reviews
Sale Price

$558.95

2 left at this price

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Usually delivered within 2 days

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Product Details

The COMP Cams 12-859-9 is a high-performance solid roller camshaft designed specifically for oval track racing applications in Chevrolet small block engines. This camshaft delivers aggressive power characteristics optimized for circle track competition.

Camshaft Specifications:

  • Advertised Duration: 257° intake / 266° exhaust
  • Valve lift: .659" intake / .680" exhaust (with 1.6 rocker ratio)
  • Lobe separation angle: 106°
  • Solid roller design for maximum durability and performance
  • Purpose-built for oval track racing engines

Key Features:

  • Aggressive profile optimized for high-RPM racing applications
  • Solid roller construction eliminates valve float at extreme engine speeds
  • Asymmetric duration provides optimized exhaust scavenging for circle track racing
  • Manufactured from premium quality core materials for extended service life
  • Compatible with Chevrolet small block V8 engines (262-400 cubic inches)

This camshaft requires supporting modifications including high-performance valve springs, roller lifters, pushrods, and proper valve train geometry setup. Designed for racing use only and not intended for street-driven vehicles.

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 + 234 more models

Usage

Strip

Exhaust Valve Lift

0.637

Intake Valve Lift

0.645

Intake Duration at .050 Inch Lift

257

Exhaust Duration at .050 inch Lift

266

Grind Number

285TKR-6

Basic Operating RPM Range

3,500-7600

Camshaft Series

Oval Track Xtreme TK

Assembly Lubricant Included

No

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

Cam Type

Solid Roller

Camshaft Material

Billet Steel

LOBE SEPARATION

106

AMAZON ASIN

B001O09PVK

Advertised Exhaust Duration

298

Advertised Intake Duration

285

Engine Family

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

Lifter Type

Solid Roller

Very satisfied! My intake shipped on Friday and I received it on Tuesday. Not only super fast shipping, but a great deal to boot!

Quick and easy.. Thanks

I ordered a hitch off of this site for Christmas, I have never heard of it nor did I know how they were, but they are great! Got my package in I'd say 4 days, very fast and it was exactly what I wanted! Only down fall was they charged me 3 times and I was short 150$ for a few days. I got my money back and I would definitely order again.

Very good customer service asked about a lot of different springs and parts for my Mazdaspeed 3.

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