The Ultimate Guide to Installing Cam Bearings in Your SBC Engine

With over 2 million SBC engines produced per year, the small-block Chevy (SBC) is a popular choice for automotive enthusiasts and mechanics alike. Installing cam bearings is a crucial step in rebuilding or modifying an SBC engine, ensuring proper camshaft alignment and performance. This comprehensive guide will provide you with a step-by-step approach to installing cam bearings in your SBC engine, highlighting potential drawbacks, and offering expert tips to guarantee a successful outcome.

Understanding Cam Bearings

Cam bearings are precision components that support the camshaft within the engine block. They provide both radial and thrust support, allowing the camshaft to rotate smoothly with minimal friction. SBC engines utilize five main cam bearings and two thrust bearings. The main bearings are responsible for supporting the camshaft along its length, while the thrust bearings prevent axial movement.

Choosing the Right Cam Bearings

Selecting the appropriate cam bearings is essential for optimal engine performance. Standard cam bearings are designed for stock camshafts, while high-performance bearings are recommended for aftermarket camshafts with aggressive profiles. Consider the following factors when choosing cam bearings:

• Camshaft type: Stock or aftermarket
• Engine application: Street performance, racing, or towing
• Bearing material: Babbitt, bronze, or aluminum-silicon alloys

Tools and Equipment Required

Before commencing the installation process, gather the necessary tools and equipment:

• Cam bearing installation tool
• Bearing driver
• Dial indicator
• Micrometer
• Plastic mallet
• Clean rags
• Engine assembly lubricant

Step-by-Step Installation

Step 1: Preparation
- Thoroughly clean the cam bearing bores in the engine block.
- Apply a thin layer of engine assembly lubricant to the cam bearings.

Step 2: Install Main Bearings
- Insert the cam bearing installation tool into the cam bearing bore.
- Position the cam bearing over the installation tool and tap it into place with a plastic mallet.

Step 3: Install Thrust Bearings
- Install the thrust bearings at the front and rear of the engine block. Ensure the thrust washer faces the correct direction.

Step 4: Check Bearing Alignment
- Install the camshaft into the engine block.
- Mount a dial indicator on the camshaft and measure the runout at the cam lobes.
- The runout should be within 0.001 inch for optimal performance.

Step 5: Final Assembly
- Apply engine assembly lubricant to the camshaft journals.
- Install the camshaft distributor gear and timing chain.
- Secure the camshaft and torque the bolts to specifications.

Potential Drawbacks

• Oversized Bearings: Installing oversized cam bearings can cause excessive clearance and reduced oil pressure.
• Misaligned Bearings: Improperly aligned cam bearings can interfere with camshaft rotation and lead to premature wear.
• Improper Lubrication: Insufficient or incorrect lubrication can result in bearing failure.

Expert Tips

• Always use a bearing driver to prevent damage to the cam bearings.
• Measure the cam bearing bores before installation to ensure they meet specifications.
• Inspect the cam bearings for any imperfections or damage.
• Follow all manufacturer instructions carefully.
• Consult with a qualified mechanic if you encounter any difficulties.

Success Stories

Story 1: A mechanic replaced a worn camshaft and installed new cam bearings in an SBC engine. The engine ran smoothly with increased power and efficiency.

Story 2: An enthusiast installed upgraded cam bearings along with an aftermarket camshaft. The modification resulted in significant performance gains on the dyno and the racetrack.

Story 3: A DIYer installed cam bearings in his classic SBC engine without any prior experience. By following the step-by-step instructions and using the right tools, he achieved a successful outcome, saving hundreds of dollars in labor costs.

Conclusion

Installing cam bearings in an SBC engine is a crucial step that requires precision and attention to detail. By following the comprehensive guide provided in this article, you can ensure a successful installation, maximizing engine performance and extending its lifespan. Remember to use high-quality cam bearings, follow the step-by-step approach, and consult with experts if necessary. With proper installation, your SBC engine will deliver years of reliable and exhilarating performance.

Call to Action

Maximize the performance of your SBC engine by installing cam bearings today. Contact our experts to discuss your specific needs and find the best cam bearings for your application. Trust us to deliver the highest quality products and technical support to ensure a successful installation.