07-CC-12V178 12 Valve 178/208 Camshaft Comb

Features:

• Fits 1989-1998 12 valve Cummins
• Complete camshaft and valvetrain combo
• Quickest turbo spool Hamilton offers
• Broad powerband with strong low RPM torque
• Supports up to 4500 RPM operation
• Handles up to 80 psi boost
• Extreme duty pushrods rated over 2000 HP
• 155 lb valve springs prevent valve float
• Larger tappets improve load distribution
• Lowers EGT and improves fuel efficiency
• Works with small or large single turbos
• 49 state EPA compliant

The Camshaft That Makes A 12 Valve Feel Alive

If you want instant response and a powerband that feels strong everywhere, this 178-208 camshaft combo is hard to beat. Hamilton Cams designed this setup for 12 valve Cummins owners who want fast turbo spool and real torque right off idle, not just big numbers on paper. It was originally built for trucks that work hard every day, but it quickly proved itself as a favorite for street builds and weekend racers alike. The engine feels smoother, pulls harder in the low and mid range, and stays responsive as RPM climbs. Drivers often notice lower EGTs and improved fuel economy, which makes a big difference when towing or running long highway miles. What surprises most people is just how much horsepower potential this cam still has when paired with the right turbo and fueling. It delivers the kind of drivability that makes your truck more fun every time you roll into the throttle.

A Complete Valvetrain Upgrade Designed To Work Together

This camshaft combo is built specifically for 1989-1998 5.9L 12 valve Cummins engines and replaces every major valvetrain component with matched high performance parts. The 178 intake and 208 exhaust duration camshaft is engineered to support quick spool, wide RPM range, and stable airflow up to 4500 RPM. Included 155 pound valve springs keep the valves under control at boost levels up to 80 psi, reducing the risk of float and power loss. Extreme duty pushrods are rated well beyond 2000 horsepower and help maintain accurate valve timing under heavy load. Larger 1.45 inch tappets increase contact surface area, improving durability and load distribution inside the block. For a true drop in installation, piston protrusion and valve face depth must meet minimum clearance requirements, with oversize head gaskets or valve reliefs available if needed. When installed and broken in correctly, this combination delivers excellent longevity, strong drivability, and proven performance across a wide range of builds.

Fitment: 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998 Dodge RAM 2500/3500 5.9L Cummins

Notes:

• Fits 1989–1998 5.9L 12 valve Cummins engines
• Includes camshaft, lifters, pushrods, springs, retainers, and locks
• Supports up to 4500 RPM and 80 psi boost
• Designed for quick spool and wide powerband
• Improves torque, EGTs, fuel economy, and spool time
• Pushrods rated for builds exceeding 2000 horsepower
• Requires .020" or less piston protrusion for drop-in fit
• Requires .055" or more valve face depth with standard gasket
• Oversize head gasket or valve reliefs may be needed
• Break-in procedure and oil pressure are critical at startup
• Valve lash should be set after hot re-torque
• Not legal for sale or use in California