Milton, you're right. I shouldn't be here, although I've adjusted the tappets on Chevrolet hot-water sixes a few times.
That little four stroke on Joe's T-6 gets a lot of attention. It's not a radial, but, it doesn't sound like a dirt bike. I think the sound it makes really sounds "right".
Bring one of your 4strokes to the Labor Day Contest, we'll put it in the raffle!
Fly safe,
dale g