Stage 3 "Big Stick" Camshaft for Cummins 5.9L/6.7L B-Series

The Colt Cams Stage 3 camshaft, also known as the "Big Stick," is engineered for enhanced performance in Cummins 5.9L and 6.7L B-series engines. Developed through extensive research and dyno testing, this camshaft aims to deliver superior mid-range torque and horsepower without compromising low-end response or drivability. Its profile includes an 181° intake duration and a 210° exhaust duration, with a lobe separation angle of 106°. This camshaft provides several performance benefits, including an average 2–3 MPG gain in fuel efficiency and a reduction in smoke output by 30–35%. It can also lead to an approximate 200°F drop in exhaust gas temperatures (EGT) and is reliable for operation up to 4,000 RPM. However, it is recommended to use upgraded valve springs for operation above 3,000 RPM. Key specifications include an intake lift of 0.280 inches and an exhaust lift of 0.307 inches. While the product page states "No*" for valve clearance required, there is a general disclaimer to always check valve clearances before installing any camshaft. For optimal performance and longevity, Colt Cams recommends a specific break-in procedure, including the use of cam lube and an oil additive with sufficient anti-scuffing properties, such as ZDD Plus.