Polymer Racing Products Carb Spacers

I like the oring too. In my limited testing the dimple never made a difference. The burr finish did. I think if you look around there are some fairly technical papers and videos out there was to why this is.

The dimple is a concave recess in a surface. The burr finish is a random raised sharp edge. IIRC that has something to do with it.

The myth that a moving column of air and fuel responds like a golf ball is just that. A myth.

BTW, how is your burr finish work coming along?