Stage 3 "Big Stick" Camshaft

The Colt Cams Stage 3 "Big Stick" Camshaft is a performance upgrade specifically designed for Cummins 5.9L and 6.7L B-series engines. Developed through extensive research and dyno testing, this camshaft offers an optimized 181/210 profile with a 0.280" intake lift and 0.307" exhaust lift, and a 106° lobe separation angle. Key benefits of this "Big Stick" camshaft include an average 2-3 MPG increase in fuel efficiency and a significant reduction in smoke output by 30-35%. Additionally, it can contribute to an approximate 200°F drop in exhaust gas temperatures (EGTs), aiding in cooler engine operation. The camshaft is rated for reliable performance up to 4,000 RPM and is designed as a "drop-in" installation on most engines, meaning no additional modifications are typically required. However, Colt Cams recommends upgraded valve springs for operation above 3,000 RPM. Installation notes emphasize following Cummins procedures and using adequate assembly lube. Specific details include a retainer torque of 44 ft-lbs with red Loctite, potential clearance requirements for Common Rail retainers, and the recommendation to always use new or re-crowned lifters. The "Big Stick" cast billets specifically require 2nd gen 24V lifters (Cummins Part# 3942565). It is crucial to always check valve clearances before installation, especially if the cylinder head has been planed, the block decked, or valve recessions have occurred, as extra clearance may be needed with aftermarket connecting rods. A break-in procedure involving specific RPMs for a set duration and the use of a zinc additive in engine oil is also detailed.