I thought I saw a post on these but did a search and couldn't find it, so I am posting the information on this product and apologize if this is a repeat post. There have been several DIY options to lock rocker shafts; roll pins, set screws, .30 cal casings, etc. The Rocker Lockers will work if the valve train noise is the result of the shaft rotating. Only issue I see is that they will make shaft removal a bit more difficult; the bushings will have to be removed or the shafts tapped or pressed out. I think it is a worthwhile improvement. Not sure if it will work or is required for aftermarket billet support plates like the Vulcan or Woods support plates. Rocker Lockers - YouTube Dan.1977P, if you are still getting that tick, you might want to take a look at your rocker shafts for witness marks as shown in the video.