
A new camshaft for Cummins 5.9L / QSB early model with part number 3914639 is an OEM‑style replacement camshaft designed for early 6B/6BT/QSB 5.9 engines that restores factory valve timing, lift, and engine performance.
Why Shop with Young & Sons?
With over 75 years of diesel engine expertise, Young & Sons offers quality and fast availability for all your engine needs.