Cummins 5.9L Cams

Colt Cams is proud to introduce our latest grinds for the Cummins 5.9L B series engine! We've worked long and hard to develop these great new profiles. We've dyno'ed some 50 different combinations of durations, lobe separation and installed centerlines to come up with the ultimate cam for your Cummins 5.9. We have a large quantity of new billets in stock ready for you! Our 5.9L Cummins cams are available in 3 stages:

Stage 1: The best grind for fuel economy and bottom end torque!

• Straight drop in
• No clearance issues or springs required
• Lobe separation, higher lift and longer duration, improves air flow by approximately 30%
• Reduces turbo lag, faster spool up
• Greatly improved throttle response
• Approximately 25% reduction in smoke
• 100-150° EGT drop
• 1-3 MPG increased fuel economy on average
• RPM: Idle 2700

Stage 2: This is very similar to stage 1 but with a longer duration and lift on the exhaust side for engines with a slight restrictionor if you just want a little more exhaust flow.

• RPM: Idle 3000

Stage 3: Nicknamed the "BIG STICK". It has gained the most popularity. This cam delivers the strongest mid-range torque and H.P possible but still has good bottom end and drivability. No mods are required but we do recommend a set of H.D. springs. Average 2-3 MPG increase 30-35 % smoke decrease Approximately 200° EGT drop Good to 4000 rpm At the bottom of this page are the specs for the stock and performance grinds. The secret to the outstanding performance of these cams are their ramp velocity and acceleration. Check out our testimonials page to see how the Colt Cam Stage III has worked for others.
	Key in this position retards cam.  Reference only. Colt Cams are all ground to exact C/L’s for best Results and piston clearance.
Click on images for a larger view
Note: Detail to fillet radius. Optional retainer plate. (All cams tapped to accept this on new billets.) Comparison of lobe widths to Colt Cams. Comparison of semi finished chill cast billet and finished cam.
Cummins 5.9 Cam Spec Duration Cam Lobe Description Prof. I.D.# @ .050 ADV. Lift Sep INT. 159° 0.235 102.0 Stock 2nd Generation 12V 1994-1998.5 EXH. 204° 0.263 INT. 159° 0.235 107.5 Stock 2nd Generation 24V 1998.5-2002 EXH. 206°   0.297       INT. 163° 0.237 98.5 Stock 24V C.R. 2003-2007 EXH. 191° 0.299 Stage 1 INT. 175° 0.251 103.0 Hi Torque bottom end Fuel economy cam C.332.S EXH. 206° 0.297 Stage 2 INT. 175° 0.251 104.0 New Torquer Cam (Better exh. Flow) C.341.S EXH. 210° 0.307 Stage 3 INT. 181° 0.280 106.0 H.D. Big Stick best all round power Cam C.343.S EXH. 210° 0.307 Valve lash all grinds INT: .010" EXH .020" Follow Cummins installation instructions, use adequate amounts of assembly lube and add GM EOS or Kirban performance ZDDP plus to ensure no break-in damage due to the new low zinc oils on the market. NOTE: C.R. cams can not grind to stage 3 only to 1 and 2. Must use 24V 2nd core or new cast billet cams. BREAK IN PROCEDURE Cam Lube on all lobes and lifter faces. Oil all bearing journals and lifter barrels. Always turn engine over by hand before starting, check for clearances and proper timing location. Fire up to 1800 2000 rpm. for 18 20 minutes.  Note: Most oil companies have taken out a percentage of additives that are meant for anti-scuffing for break in on flat tappet cams. Always add a bottle of EOS (Engine Oil Supplement) or ZDDP to your oil before fire up on new engines.