Understanding Camshaft Specifications for the Stock Chevy 350
Knowing the camshaft size in a stock Chevy 350 engine is crucial for selecting the most suitable camshaft to enhance your vehicle's performance. While the engine resembles a human heart, the camshaft functions like veins, playing a pivotal role in delivering fuel to the engine.
A camshaft is a component in mechanical systems that transforms rotary motion into linear motion, controlling the fuel input during the engine's combustion cycle and facilitating the expulsion of exhaust gases.
The camshaft operates like a timing mechanism, regulating the opening and closing of both intake and exhaust valves. In vehicles, camshafts are linked to the crankshaft's rotation via a timing chain or belt, and they help define valve overlap during the exhaust stroke at top dead center.
Camshaft Specifications for Stock Chevy 350
Introduced by GM in 1967, the Chevy 350 engine quickly gained popularity, being featured in models such as the Chevrolet Caprice and the Chevrolet Corvette.
This engine consists of two main components: a hydraulic lifter and a hydraulic camshaft. The typical intake duration is about 218 degrees, while the exhaust duration is around 0.5 RPM. The lift capacity of the intake and exhaust valves is approximately 0.457 inches, with a total duration of 268 degrees. The intake valve lobe center-line measures about 105 degrees, while the exhaust valve is around 110 degrees, featuring a rocker arm ratio of 1.5:1.
Stock Cam Specifications
The cam size in a stock Chevy 350 usually falls within the range of 268 to 292.
Torque Specifications
Alongside size, torque specifications are vital considerations for the camshaft. The timing chain is secured with three bolts, each requiring a torque of approximately 20 foot-pounds. Additionally, the bolts connecting the pistons to the crankshaft have a torque of 20 foot-pounds, while the second and third bolts require 45 and 75 foot-pounds, respectively.
Understanding these specifications is critical for ensuring optimal performance when selecting a camshaft for your stock Chevy 350 engine.
Recommended Camshafts for Stock Chevy 350
The camshaft is an essential component for achieving smooth engine operation. Choosing from the best camshafts will significantly influence valve lift capacity, RPM range, lobe separation angle, and overall performance. Here are some recommended options:
- COMP Cams CL12-600-4: Features a duration of 227/241 at .050”, with an operating range of 2,000 to 5,800 RPM, providing excellent exhaust performance.
- SB Chevy 283 327 350 400 Hi-Perf RV Cam: Offers a 108-degree lobe separation angle, 0.480 valve lift, and an RPM range of 2,000 to 6,500 with a duration of 282 degrees at 0.500”.
- COMP Cams 12-602-4 Big Mutha: Boasts an RPM range of 2,200 to 6,100, a compression level of 9.5:1, and a duration of 243/257 at .050”.
Frequently Asked Questions
What is the Largest Cam for a Stock 350?
The COMP Cams CL12-600-4 is considered the largest cam for a stock 350, providing substantial improvements in horsepower and torque. It has been a reliable choice for small block engines since 1976.
What Type of Camshaft is Best?
Choosing the best camshaft depends on your vehicle's engine application. For unmodified stock engines, camshafts with a duration between 195 and 210 degrees at a .050” lift are ideal. Exceeding 210 to 220 degrees may reduce intake vacuum and affect engine performance.
How Much Lift Can Stock 350 Heads Handle?
Stock 350 heads typically support lifts up to .480 inches. Some enthusiasts report success with .500+ lifts, but it's advisable to remain within manufacturer recommendations for optimal performance.
How Much Horsepower Does a Cam Add to a Chevy 350?
The horsepower increase from a camshaft installation generally ranges from 20 to 30 horsepower, enhancing overall engine performance.
Conclusion
Understanding the camshaft specifications for a stock Chevy 350 is essential for selecting a camshaft that meets your vehicle's performance needs. Enhancing your engine's horsepower will improve acceleration and overall vehicle performance.
For more information, tips, and resources on engine maintenance, visit Car Care Lab or check out our dedicated section on Engines.