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Message: [QUOTE="me2, post: 366366, member: 3825"] So, the CNC stuff is taking up a lot of time. Check the thread for a minimal update if you are interested. I'm !&^%$* that the CNC stuff has become a project within this project and totally derailed things. I keep telling myself that in the long run its a good thing. Seems like it takes a project to make me update tools and equipment sometimes. Maybe I should learn from that and update my tools BEFORE I start a new project that might need them. Anyway... the Cummins 24V marine valve cover arrived. Part number 3969481 for the cover, $180, part number 3973511 for the filler cap, $6. [ATTACH=full]89251[/ATTACH] As previously discussed, and as I knew before I ordered it, the cover is not a direct fit on a 6.7. Shape wise, it fits pretty much perfectly on the exhaust side. [ATTACH=full]89252[/ATTACH] Shape wise, it fits just about perfect on the back. [ATTACH=full]89253[/ATTACH] Shape wise, it fits perfectly in the front. [ATTACH=full]89254[/ATTACH] Shape wise, where it doesn't fit well is on the intake side, where the injectors are. On the 24V and 5.9CRs, the valve cover cuts in where the injectors are. On the 6.7, it doesn't have to, so it doesn't. The side is straight. [ATTACH=full]89255[/ATTACH] Here are the two valve covers sitting upside down, side by side. Stock 6.7 on the left, 24V marine on the right. The intake side of the valve cover is on the right of each. The 6.7 valve cover is straight and the 24V marine cover has the cut ins. Here is a (bad) view of the 24V marine cover on the 6.7. Not how the gasket is straight and the marine cover has cut ins. [ATTACH=full]89256[/ATTACH] Luckily the "rocker lever housing", what Cummins calls the aluminum piece that goes between head and the valve cover, does not appear to have anything in the way to prevent the marine valve cover from closing. The 6.7 valve cover gasket, however, does prevent the marine valve cover from closing. [ATTACH=full]89257[/ATTACH] The cut ins on the marine valve cover sit directly over a boss that is part of the rocker lever housing. There is no issue with them. However, the connector for the injector wiring harness sits over the bosses in 2 locations and prevents the cover from fully coming to rest on the rest of the gasket. Actually, its not even the connector that is the problem, it is the plastic arm that sits next to the connector that holds the wires and prevents them from contacting a rocker arm. [ATTACH=full]89258[/ATTACH] The other issue is the sealing lip. The marine valve cover has a groove cut in the bottom of it all the way around. The 6.7 valve cover has a flat bottom. [ATTACH=full]89259[/ATTACH] There are a couple ways to make the cover fit. 1) Trim the wiring harness and weld aluminum extension plates between the cut ins on the marine cover so that it has a straight sealing surface on the intake side. 2) Replace the 6.7 injector harness/valve cover gasket with a 5.9 valve cover gasket ($200) that fits the 6.7 wiring harness and then build up the bosses on the rocker lever housing so that they are flat and thus the marine valve cover could seal to them. 3) Replace the 6.7 rocker lever housing (about $200) and the valve cover gasket (about $110) with parts that work with the marine cover. I believe that some of the later 5.9CRs have a valve cover gasket that will work with the 08 wiring harness, ditto for the rocker lever housing. The other issue is that the marine valve cover is a bit taller than the 6.7 valve cover. This will allow it to be milled smooth to work with the 6.7 style valve cover gasked if needed. I keep thinking that a similar marine valve cover should exist for the 6.7. But I've yet to find one. I have not yet decided how I am going to resolve the valve cover fit issue. [/QUOTE]