The top of a Cummins is the first thing anybody sees when you pop the hood, and it is also where one of the engine's dirtiest habits lives. Two upgrades clean up both problems at once: a billet valve cover and a catch can. One makes the top end look the way a built truck should and gives you clean ports to plumb from. The other stops the oil that the engine is constantly breathing out from coating the inside of your intake. Run them together and you fix the looks and the function in one shot.
What the Valve Cover Does
The factory valve cover is plastic, it cracks, and it looks like exactly what it is. Our FSD 5.9L/6.7L Cummins Billet Honeycomb Valve Cover is machined out of solid aluminum, it is not going to crack or warp, and it dresses the top of the engine the way the rest of your build deserves. Just as important, a billet cover gives you clean, threaded ports to run your crankcase ventilation from, instead of fighting the factory plastic. That is what makes the catch can side easy.
Why You Need the Catch Can
Every diesel pushes a little combustion past the rings and into the crankcase. That pressure has to go somewhere, and from the factory it gets routed back into the intake, oily air and all. Over the miles that oil coats your intake tract and bakes onto your intercooler and valves. A catch can sits in that line and traps the oil before it ever gets back to the intake, so your intake side stays clean and your air charge stays where it should be.
For a clean, complete setup the FSD Catch Can Kit for 1998.5+ Cummins gives you the can, the lines, and the fittings built for the truck. If you want the can on its own to plumb into your own setup, the FSD Universal Four Port Catch Can drops into almost any build.
| Upgrade | What it fixes | Why it matters |
|---|---|---|
| Billet valve cover | Cracked plastic, plain looks, messy ports | Durable, clean billet top end with real ports |
| Catch can | Oily blow-by going back into the intake | Clean intake, intercooler, and valves |
| The two together | Both at once | Looks and function in one job |
Why They Belong Together
You are already in there. Pulling the valve cover to upgrade it is the exact same job that sets you up to run a catch can the clean way, off real ports instead of zip-tied lines. Do them as a pair and you walk away with a top end that looks the part and an intake that stays clean for the life of the truck. If you want to go further on the looks side, the billet route runs all the way up through the engraved and anodized covers we carry.
Shop FSD Billet Valve Covers and Catch Cans →