Stock Duramax engines uses a 5mm dowel pin to keep the engine timed. Its fairly common to see high mileage or high horsepower engines with damaged or sheared dowel pins. Replacing your pinned OE cam with a straight keyed cam can increase your trucks reliability and prevent dangerous mechanical changes to timing.
DHD's stock improved camshafts are modify to accept a straight keyway for added shear strength and dependability. All camshafts are cleaned, inspected and have polished bearing and lobe surfaces. Camshafts are shipped with the keyway installed. No additional changes are required to your gear or hardware.
Fitment: (Use the picture below to help you determine which camshaft you need)
See Below:
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