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What cam to up grade on a 78 Chevy 350 truck motor?

I can't recommend a specific camshaft without knowing more about your Chevy 350 truck engine and your desired outcome. Here's why and what information I need:

Factors that determine the best camshaft:

* Current Engine Setup: What are your engine's current specs? This includes:

* Compression Ratio: Higher compression will benefit from a more aggressive cam.

* Heads: Are they stock or aftermarket? This influences flow and the camshaft's compatibility.

* Intake and Exhaust Manifolds: The type of manifolds will affect exhaust flow and the cam's suitability.

* Transmission: Automatic or manual? This determines the ideal stall converter or clutch setup.

* Desired Performance: Are you looking for:

* Increased Power: A cam with more lift and duration will provide more power, but might sacrifice low-end torque.

* Improved Fuel Economy: A mild cam might improve fuel economy, especially at cruising speeds.

* Smooth Idle: A cam with less duration and lift will provide a smoother idle but might limit power.

* Torque: A cam with a shorter duration and more lift can improve low-end torque.

* Driving Style: How do you plan to use the truck?

* Daily driver?

* Off-roading?

* Towing?

Cam Selection Process:

1. Research: Find reputable camshaft manufacturers (e.g., Comp Cams, Crane Cams, Lunati).

2. Use Cam Selection Tools: Most manufacturers have online tools that help you choose a cam based on your engine specs and desired performance.

3. Consult Experts: Talk to a local engine builder or performance shop for advice and recommendations.

General Tips:

* Start with a mild cam: A mild cam provides a good balance of power and drivability.

* Consider the cam's operating range: Choose a cam that matches your desired RPM range.

* Adjust valve springs: If you're installing a more aggressive cam, you'll likely need to upgrade your valve springs.

Remember: Upgrading your camshaft can significantly impact your engine's performance. It's crucial to choose the right cam for your specific needs and to have it properly installed.