I have Eddy heads, so I'd have to remove intake and galley cover. I never cared for how the engine sounded from the get-go 8 years ago. Ran great! Always made noise. If it's going to sound like a flat tappet, I'll go flat tappet. I've been told due to the fast closing cam ramps and stainless valves this can happen but don't really know. Don't want to revisit this rabbit hole.