Comp Cams Thumpr Hydraulic Roller Camshaft - 12-600-8

Comp Cams Part Number 12-600-8 is a Thumpr 227/241 hydraulic roller camshaft designed for Chevrolet Small Block 262–400 engines (1958–1998). This grind delivers the signature Thumpr aggressive idle along with strong mid-range power and crisp throttle response. Ideal for street/performance builds seeking both sound and performance, operating effectively in the 1,900–5,600 RPM range.

Important Note:
This camshaft must be used with a melanized or nitrided distributor gear. It is not compatible with standard cast or steel gears without matching surface treatment. Failure to use the proper gear voids all warranties and return policies.

 

Product Features

• Thumpr series hydraulic roller camshaft

• Aggressive, choppy idle with strong midrange performance

• Designed for 262–400 c.i. Chevy Small Block engines

• Broad 1,900–5,600 RPM operating range

• 3-bolt camshaft gear attachment

• Requires melanized or nitrided distributor gear

 

Specification Value Camshaft Type Hydraulic Roller Series Thumpr Engine Family Chevrolet 262–400 c.i. (1958–1998) RPM Range 1,900–5,600 Advertised Duration (Int/Exh) 283 / 303 Duration @ .050" (Int/Exh) 227 / 241 Valve Lift (Int/Exh) 0.511 / 0.497 Lobe Separation Angle 107° Gear Attachment 3-Bolt Usage Street/Performance Lifter Type Hydraulic Roller Warranty 12 Months UPC 036584148388 Emissions Code Not specified Make Chevrolet California Proposition 65 Cancer and Reproductive Harm (P65Warnings.ca.gov)

 

Fitment

• Make: Chevrolet

• Engine Family: 262 / 283 / 302 / 305 / 307 / 327 / 350 / 383 / 400 c.i. Small Block V8

• Model Years: 1958–1998

• Cam Gear Style: 3-bolt