The Comp Cams 268H camshaft is designed for performance street and light off road applications, offering a balanced blend of power and driveability. This profile targets enthusiasts who want improved throttle response and midrange punch without extreme idle behavior.
Below is a detailed overview of key specifications, performance traits, installation notes, and real world usage scenarios for the 268H duration cam in small block Chevy and similar V8 setups.
| Specification | Value | Notes |
|---|---|---|
| Cam Type | Flat Tappet Hydraulic | Traditional design, durable for street and light competition |
| Duration @ 0.050” | 268 degrees | Measured intake and exhaust duration |
| Lobe Separation Angle | 112° | Balances overlap for responsiveness and efficiency |
| Intake & Exhaust Duration | Typically near equal | Optimized for midrange torque and street use |
| Valve Lift | ~0.480” intake, ~0.486” exhaust | Adequate for moderate lift heads and standard rockers |
| Recommended RPM Range | ~4,500 – 6,200 rpm peak | Power band suited for street and weekend driving |
| Application Focus | Street, daily drivers, mild drag, show | Works well with moderate cam gears and mild tuning |
Performance Characteristics of the 268H Cam
Power Band and Throttle Response
The 268H delivers a pronounced midrange push, making the engine feel lively in everyday driving and strong in street strip scenarios. The moderate duration keeps idle stable while improving vacuum signal consistency.
Compatibility with Valvetrain and Heads
This cam pairs well with standard small block Chevy cast iron or aluminum heads, especially when matched to moderate lift rockers and appropriate spring rates. Verify valve spring stability at higher lift and rpm during testing.
Installation and Break In Procedures
Timing, Clearances, and Components
Initial installation requires checking lobe separations, centerline timing, and using correct lifter clearances. Break in should avoid full throttle until after the recommended seating period to preserve flat tappet performance.
Gears, Ratios, and Idle Quality
Choose a cam gear that aligns with the 268H timing window, typically advancing total timing slightly. Proper idle mixture and throttle pedal calibration help optimize driveability while protecting the cam profile.
Real World Driving Scenarios and Tuning Tips
Daily Driving and Light Traffic
In stop and go conditions, the 268H offers smooth power delivery without excessive bounce or harshness, especially when paired with a quality intake manifold and well matched carburetor or throttle body.
Weekend Drives and Traction Considerations
On weekends, this cam supports controlled launches and midrange pulls, particularly when combined with appropriate gearing and suspension settings. Adjust shift points and fueling to protect the torque curve and avoid wheelspin.
Key Takeaways and Recommendations
- Optimal for street performance and light competition applications
- Choose correct gear ratio and ignition timing to match the 268H duration
- Verify valvetrain component compatibility, especially springs and retainers
- Monitor idle quality, vacuum signals, and throttle response during break in
- Consider intake, exhaust, and tune adjustments to fully realize the 268H potential
FAQ
Reader questions
Will the 268H work well in a daily driver with automatic transmission?
Yes, the 268H is a popular choice for daily driven automatics, delivering responsive midrange power and stable idle while remaining compliant with street emissions expectations.
Can this cam be used with a mild performance intake and exhaust?
Absolutely, pairing the 268H with a performance intake and cat back exhaust enhances breathing and power, provided the system is tuned for the speed density or mass air setup in use.
How does the 268H compare to higher duration cams like 270 or 272?
Compared to higher duration cams, the 268H keeps idle cleaner, offers better drivability at low rpm, and sacrifices some top end power, making it a balanced option for mixed usage.
Do I need upgraded springs or retainers for the 268H in a high rpm track build?
For mostly street and light track use, OEM springs are typically sufficient, but if you push higher rpm or aggressive lift, consider verifying spring rates and retainer strength to ensure long term reliability.