Billet Oil Cap - BlackApplications: All K Series Engines Note: * Install the sticker after you put the cap on the valve cover, if will keep our K Tuned logo sitting perfectly straight. After a countless number of requests, the K Tuned Billet Oil Cap is now available. For a design, we weren't trying to reinvent the wheel here, so we kept things very simple. Starting with 6061 billet aluminum blank, we threaded the bottom, machined a groove for an o ring seal, cut out the