No, I don't think I'd bother running without any spacer at all. That usually just kills the power.

I'm more interested in figuring out the difference between an open spacer and the hour glass shape that mates up with the Super Victor plenum. I had to have some spacers custom built with the hour glass shape because nobody sells that shape. I've used open spacers in the past with good results but I think the hour glass shape will pick up even more power.

It will be interesting to see if the extra height of these spacers helps or hurts the power. It will also be interesting to see if the different shear plates make any difference. I currently have three brands of shear plates to try out.