I'm already looking at what I need for a fixture to make up for the angle on the mill table. Might not have enough daylight under the head. That's where piloted tooling and using the tilting table on the drill press may work. Not as rigid but the pilot should make up for most of that. Get a set of shims would allow you to index each plug in certain increments to optimize it's presentation to the chamber? Got to be worth 1/2hp per cylinder at least, don't you think? I really do think the depth and indexing would be beneficial but I don't think you would begin to see measurable results unless you had a marginal combination, or are running a max effort motor.
I don't think a fortune is to be made here. Might be able to get $50 a head plus shims? Most of you guys are frugal. :poke: I did not say cheap. I'm very careful where I spend my fun money too. :lol: