Comp Cams 12-211-2 270H Magnum Hydraulic Flat Tappet Camshaft User Manual

1. Overview

The Comp Cams 12-211-2 270H Magnum Hydraulic Flat Tappet Camshaft is engineered for 1955-1987 Small Block Chevrolet engines. This camshaft is designed to enhance engine performance within an operating range of 1,800 to 5,800 RPM. It features a 224/224 duration at .050" and a 110-degree lobe separation angle.

Key characteristics include:

• High performance profile, suitable for street machines.
• Optimized for use with aftermarket torque converters (2000+ stall recommended) and lower gear ratios.
• Produces a mild rough idle.
• Compatible with 9.5:1 compression ratios.
• Designed to be gentle on valve train components, allowing for mild ratio rocker arms and traditional performance valve springs.
• Fits Chevrolet GEN 1 Small Blocks including 262, 265, 267, 283, 302, 305, 307, 327, 350, and 400 cubic inch engines.
• Does not fit LT1/LT4 or factory roller Small Blocks manufactured from 1985 and newer.

Image 1: The Comp Cams 12-211-2 270H Magnum Hydraulic Flat Tappet Camshaft.

2. Safety Information

Always prioritize safety when working with automotive components. Improper installation or handling can lead to serious injury or damage to the engine.

• Professional Installation Recommended: Camshaft installation requires specialized tools, knowledge, and experience. It is highly recommended that this component be installed by a qualified automotive technician.
• Eye Protection: Always wear appropriate eye protection when working on an engine.
• Gloves: Wear protective gloves to prevent cuts, scrapes, and exposure to chemicals.
• Engine Cool Down: Ensure the engine is completely cool before beginning any work.
• Secure Vehicle: Always use jack stands to support the vehicle securely when working underneath it. Never rely solely on a jack.
• Chemicals: Be aware of and follow safety guidelines for all automotive fluids and chemicals used during installation.
• Proposition 65 Warning: This product may expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.

3. Setup and Installation

This section provides a general overview of camshaft installation. Refer to a comprehensive service manual for your specific vehicle and engine for detailed, step-by-step instructions.

3.1 Pre-Installation Checks

• Verify engine compatibility (1955-1987 Small Block Chevy, excluding LT1/LT4 and 1985+ factory roller engines).
• Ensure all necessary components are available, including new hydraulic flat tappet lifters, appropriate valve springs, retainers, and locks.
• Inspect the camshaft for any shipping damage or manufacturing defects.
• Clean the camshaft thoroughly to remove any protective coatings or debris.

3.2 Installation Steps (General)

1. Remove the engine from the vehicle or prepare it for camshaft access (e.g., remove radiator, grille, timing cover, intake manifold, cylinder heads, pushrods, lifters).
2. Carefully remove the old camshaft.
3. Apply a generous amount of high-quality camshaft assembly lube to all cam lobes and journals of the new Comp Cams camshaft.
4. Carefully slide the new camshaft into the engine block, ensuring not to damage the cam bearings.
5. Install the timing set, ensuring proper alignment of timing marks.
6. Install new hydraulic flat tappet lifters. Apply assembly lube to the lifter bottoms.
7. Reassemble the engine components, ensuring all fasteners are torqued to manufacturer specifications.

Image 2: A camshaft shown with a set of hydraulic flat tappet lifters, essential for proper operation.

3.3 Camshaft Break-In Procedure (Crucial for Flat Tappet Cams)

Proper break-in is critical for the longevity of hydraulic flat tappet camshafts and lifters. Failure to follow this procedure can result in premature wear and component failure.

• Use a high-zinc (ZDDP) engine oil or a ZDDP additive during break-in and for subsequent oil changes.
• After initial startup, immediately bring the engine RPM to 2000-2500 RPM and vary the engine speed between 2000-3000 RPM for at least 20-30 minutes.
• Avoid prolonged idling during the break-in period.
• Ensure adequate cooling and oil pressure throughout the break-in.
• After the break-in, allow the engine to cool completely, then change the oil and oil filter.

4. Operating Characteristics

The Comp Cams 12-211-2 camshaft is designed to provide a noticeable performance improvement in compatible Small Block Chevy engines. Users can expect the following operational characteristics:

• RPM Range: Optimal power delivery occurs within the 1,800-5,800 RPM operating range.
• Idle Quality: The camshaft will produce a mild, noticeable rough idle, characteristic of a performance camshaft.
• Torque Converter: For best street performance, an aftermarket torque converter with a stall speed of 2000 RPM or higher is recommended.
• Gearing: Lower (numerically higher) rear axle gears will complement the camshaft's power band and improve acceleration.
• Compression: This camshaft performs well with engine compression ratios around 9.5:1.

5. Maintenance

Proper engine maintenance is essential for the longevity and performance of your Comp Cams camshaft.

• Oil Changes: Adhere to your engine manufacturer's recommended oil change intervals. For flat tappet camshafts, it is crucial to use engine oil with adequate ZDDP (Zinc Dialkyldithiophosphate) content to prevent premature wear. Many modern oils have reduced ZDDP; consider using a specific high-performance oil or a ZDDP additive.
• Valve Train Inspection: Periodically inspect valve train components (rocker arms, pushrods, valve springs) for wear or damage. Listen for unusual noises that may indicate issues.
• Engine Tuning: Ensure your engine's carburetor or fuel injection system is properly tuned for optimal air/fuel mixture and ignition timing. Incorrect tuning can negatively impact performance and engine health.
• Cooling System: Maintain a properly functioning cooling system to prevent engine overheating, which can stress engine components.

6. Troubleshooting

If you experience issues after installing your Comp Cams camshaft, consider the following common troubleshooting points. For complex issues, consult a professional automotive technician.

6.1 Common Issues

• Excessive Rough Idle/Stalling: This camshaft produces a mild rough idle. If the idle is excessively rough or the engine stalls, check for vacuum leaks, proper carburetor/EFI tuning, and correct ignition timing. Ensure the torque converter stall speed is adequate.
• Lack of Power: Verify correct camshaft timing (timing chain alignment). Check for proper valve spring pressure and correct valve lash (if adjustable). Ensure the engine is receiving adequate fuel and spark.
• Valve Train Noise (Ticking/Clattering): This could indicate improper lifter preload (for hydraulic lifters), worn lifters, insufficient oil pressure, or incorrect valve spring pressure. Address immediately to prevent further damage.
• Low Oil Pressure: Ensure the oil pump is functioning correctly and that the correct viscosity oil is being used. Low oil pressure can lead to rapid camshaft and lifter wear.
• Engine Overheating: Verify the cooling system is functioning properly. Incorrect ignition timing can also contribute to overheating.

If troubleshooting steps do not resolve the issue, seek assistance from a certified mechanic specializing in performance engine work.

7. Specifications

8. Warranty and Support

Comp Cams products are manufactured to high standards. For specific warranty information regarding the 12-211-2 camshaft, please refer to the official Comp Cams warranty policy available on their website or included with your product packaging.

If you require technical assistance, have questions about installation, or need to inquire about warranty claims, please contact Comp Cams directly through their official customer support channels.

Contact Information: Please visit the official Comp Cams website for the most current contact details, including phone numbers and online support options.