Custom designed Tappets by Colt Cams. Featuring maximum crown or convex surface. This is the #1 feature to guarantee rotation on the Cummins. Over the last few years, we've noticed large inconsistencies in the crown with the current tappets on the market. Some are flat and even dished! Colt Cams addressed this issue using similar measurements of the standard tappets and maximizing the crown.
Colt Cam part number: Tappets
Stock Image, may not be actual part.