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COMP Cams 12-683-5 Launcher Series Solid Flat Tappet Camshaft Chevrolet Small Block - 248/252

(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 + 239 more models)

Manufacturer

Picture for manufacturer COMP Cams

Part Number

12-683-5
4 reviews
Sale Price

$325.95

Estimated ship date Wednesday, November 25

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Product Details

The COMP Cams Launcher Series 12-683-5 is a high-performance solid flat tappet camshaft designed specifically for Chevrolet small block engines. This camshaft features aggressive 248/252 duration specs that deliver strong mid-range to upper RPM power, making it ideal for street/strip applications and weekend race cars.

Camshaft Specifications:

  • Duration at .050": 248° Intake / 252° Exhaust
  • Advertised Duration: 292° Intake / 300° Exhaust
  • Valve Lift (with 1.5 ratio rockers): .512" Intake / .535" Exhaust
  • Lobe Separation Angle: 110°
  • Solid flat tappet design for maximum performance and durability
  • Recommended RPM range: 2,000-6,200 RPM

Key Features:

  • Launcher Series profile optimized for aggressive street and bracket racing applications
  • Excellent throttle response and strong acceleration
  • Provides noticeable lope at idle with authoritative exhaust note
  • Requires aftermarket valve springs, retainers, and performance valve train components
  • Best suited for engines with compression ratios of 9.5:1 or higher
  • Works well with headers, intake manifolds, and other supporting performance modifications

This camshaft requires solid lifters (not included) and proper valve train setup including upgraded springs, retainers, pushrods, and rocker arms. A performance torque converter (2,500-3,000 stall) and rear gear ratio of 3.73:1 or higher is recommended for optimal performance. Professional installation and valve train setup is strongly advised.

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 + 235 more models

Lifter Type

Solid Flat Tappet

Exhaust Valve Lift

0.468

Intake Valve Lift

0.468

Intake Duration at .050 Inch Lift

248

Exhaust Duration at .050 inch Lift

252

Basic Operating RPM Range

3200-6,800

Camshaft Material

Cast Iron

Camshaft Series

Launcher Series

Grind Number

LB2745

Cam Type

Solid Flat Tappet

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.

Advertised Intake Duration

274

Camshaft Gear Attachment

3-Bolt

Advertised Exhaust Duration

278

LOBE SEPARATION

107

Usage

Street/Strip

Engine Family

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

AMAZON ASIN

B000P5DBBA

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Great pricing and quick shipping. GREAT

Awsome service and prices,Thanks alot

This store had a lot of products more than most other sites I looked at. The order was processed quickley and shiped the next day. I will use them again.

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