COMP Cams 12-268-4 SBC Hydraulic Camshaft/Rhoads 8178 Lifters Kit
Chevy Small Block V8, Hydraulic Flat Tappet Camshaft Type, 268 Intake Duration
- 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
Build Your KitYou're almost there! This kit has an option or two for you to select. Let us know which options you want for your new kit.
- (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
Vacuum Rule Cam Chart (GIF)
282-122684 Specs (PDF)
- Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.
What's In The Kit
COMP Cams 12-268-4 S/B Chevy Vacuum Rule Hydraulic Cam, 1800-5800 RPMPart # 282122684Qty x 1
Rhoads Lifters 8178 Chevy Hydraulic LiftersPart # 6118178Qty x 1
Q & A
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.
Follow along as we install a Pete Jackson Noisy Gear Drive on a Chevy 454. Learn about the installation process from Speedway Motors Street Tech Kevin.
To get the longest life and most performance out of your engine, it's important to have the valve lash set correctly. Here we show you how to set valve lash on a Small Block Chevy using a hydraulic lift camshaft in just eight steps.
Learn how to re-build a junkyard Small Block Chevy. A step-by-step guide on how to select a SBC, machine the valve guide bosses down, and what parts to use to upgrade to your personal liking.