Description
Colt Cam Stage 4 – 5.9 & 6.7L Cummins Includes Colt Cam Tappets and Retainer
Stage 4: Similar to the Cummins stage 3 but runs a larger EXH profile. Great for max flow on large singles or compound turbo.
No mods are required, but we do recommend a set of springs if revving over 3000 rpm.
Includes TAPPETS: We recommend only COLT CAMS CUSTOM 1.4 diameter max crown lifters.
Includes RETAINER: All our cams are drilled and tapped to accept our custom retainer to keep the gear from walking off.
- Duration @ .050 – INT 181° EXH 218°
- Cam Lift .280
- Lobe seperation 107.5
- Approximately 200° EGT drop
- Good to 4400 rpm
BREAK IN PROCEDURE
- Cam Lube on all lobes, lifter faces and oil pump gears.
- 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, so please ask your local auto parts professional for the best zinc additive they have and add it to your oil before you fire up your engine for the first time. (We prefer ZDD Plus.)
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- Valve lash all grinds: INT: .010″ EXH .020″ cold.
- Follow Cummins installation instructions, use adequate amounts of assembly lube.
- Retainer torque 44 ft lbs – use red loctite.
- When using our retainer, clearance is required on C.R.
