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Product Summary

267, 283, 302, 305, 307, 327, 350, 383, 400

  • Designed to fit all 1955-1986 Chevy V8's
  • Provides approximately 25% more low-end horsepower
  • Set of 16
  • Will bleed down slightly at idle and lower RPM and causing a reduction in valve duration of approximately 10° to 15°
  • Using these lifters will provide 2-3" of vacuum under 1500 RPM

Comes as a Kit

Key Specs

BrandCOMP Cams

Need To Know

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Details

Kit Includes:

  • (1) COMP Cams 12-268-4 S/B Chevy Vacuum Rule Hydraulic Cam, 1800-5800 RPM
  • (1) Rhoads Lifters 8178 Chevy Hydraulic Lifters

COMP Cams 12-268-4 S/B Chevy Vacuum Rule Hydraulic Cam, 1800-5800 RPM

  • There are many things that effect vacuum. Camshaft lobe separation, lifter style, intake manifold, piston rings, compression ratio and overall valve and engine condition.
  • Due to many and varied engine combinations, Speedway Motors offers no warranty on camshaft and or lifters for either performance, vacuum or longevity

Rhoads Lifters 8178 Chevy Hydraulic Lifters

  • It's not uncommon to pick up 2-3" of vacuum under 1500 RPM just by using these lifters.
  • Normally see 25% or more increase in low-end horsepower for performance hydraulic cams.
  • Lifters bleed down slightly at idle and lower RPM, causing a reduction in valve duration of approximately 10° to 15°, and reducing valve lift .020" to .030" at idle

Charts

Specifications

KEY SPECS
BrandCOMP Cams
GENERAL
Camshaft TypeHydraulic Flat Tappet
Intake Duration268
Exhaust Duration280
RPM Range1800-5800
Lobe Separation114 °
Intake Duration (.050" Lift)224
Exhaust Duration (.050" Lift)230
Grind NumberUsing these lifters will provide 2-3" of vacuum under 1500 RPM
Lifter TypeHydraulic Flat Tappet
Lifters IncludedYes
Sold in QuantityKit