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COMP Cams 12-268-4 SBC Hydraulic Camshaft/Rhoads 8178 Lifters Kit
COMP Cams 12-268-4 SBC Hydraulic Camshaft/Rhoads 8178 Lifters Kit

COMP Cams 12-268-4 SBC Hydraulic Camshaft/Rhoads 8178 Lifters Kit

Chevy Small Block V8, Hydraulic Flat Tappet Camshaft Type, 268 Intake Duration

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COMP Cams 12-268-4 SBC Hydraulic Camshaft/Rhoads 8178 Lifters Kit
COMP Cams 12-268-4 SBC Hydraulic Camshaft/Rhoads 8178 Lifters Kit
COMP Cams 12-268-4 SBC Hydraulic Camshaft/Rhoads 8178 Lifters Kit
COMP Cams 12-268-4 SBC Hydraulic Camshaft/Rhoads 8178 Lifters Kit
COMP Cams 12-268-4 SBC Hydraulic Camshaft/Rhoads 8178 Lifters Kit
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COMP Cams 12-268-4 SBC Hydraulic Camshaft/Rhoads 8178 Lifters Kit
COMP Cams 12-268-4 SBC Hydraulic Camshaft/Rhoads 8178 Lifters Kit
COMP Cams 12-268-4 SBC Hydraulic Camshaft/Rhoads 8178 Lifters Kit
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Part # 9109454
$299.98
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  • 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

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Details

Camshaft Type:
Hydraulic Flat Tappet
Intake Duration:
268
Exhaust Duration:
280
RPM Range:
1800-5800
Lobe Separation:
114 °
Intake Duration (.050" Lift):
224
Exhaust Duration (.050" Lift):
230
Grind Number:
Using these lifters will provide 2-3" of vacuum under 1500 RPM
Lifter Type:
Hydraulic Flat Tappet
Lifters Included:
Yes
Sold in Quantity:
Kit

Info

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

Vacuum Rule Cam Chart (GIF)

282-122684 Specs (PDF)

HOW TO INSTALL AND ADJUST ORIGINAL RHOADS LIFTER (PDF)

Important Messages

  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.
Some parts are not legal for use in California or other states with similar laws/regulations

What's In The Kit

Each kit from Speedway Motors is carefully packaged and delivered right to your door. Below is a list of all the items you should expect to receive when you order this kit. Some of these items may also be available for sale individually if you're here looking for replacement parts.
  • COMP Cams 12-268-4 S/B Chevy Vacuum Rule Hydraulic Cam, 1800-5800 RPM
    Qty x 1
  • Rhoads Lifters 8178 Chevy Hydraulic Lifters
    Qty x 1

Reviews

Q & A

Videos & Articles
  • What happens when you advance or retard a camshaft? In this tech article, we explain the pros and cons of installing your cam straight up, advancing or retarding.
  • Learn the basics to engine performance like; how does a cam work? What is Valve lift, duration, lobe separation angle, and cam profiles? Afterwords selecting the right camshaft will be less of a guessing game!
  • Picking the right camshaft can be a challenge. Use our camshaft selection guide to learn how to select the right cam for your street rod's best performance.
  • Rebuilding an engine? Stay organized by using a valvetrain rocker arm organizer tray while disassembling the valvetrain components. Learn some tips on why you shouldn't mix up lifters if you intend on using them again.

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