ProBro - which ST is that?

On the plug I posted, the element was in the process of being barfed out the hole when I removed it, but luckily it had not come off yet to play let's chew the cylinder. It's still sort of in there but the picture is just a point-and-shoot quicky.

bob27s and DJ are very vocal proponents of harshly scrutinizing fuel systems, and no freaking wonder. Anytime I start to have any kind of issue, nearly invariably [excepting disintegrating headers etc..] it is fixed by a run through of the fuel system. I've always "known" the value of a good test stand for clearing out the airframe variables, but I am very happy now that I got off my duff and set myself up with a solid new test stand rig early this year, versus anything I kludged together in the past out of bubble gum and scrap lumber.

CP - here's an off the cuff question, just looking for a broad answer - say your setup on a typical strong .40-.50 is working well and maybe close to ideal. Add a .005" shim - how much rpm drop would you expect to see? 2 shims? Is it much? Not competing myself, I've never toyed with compression limits.

MJD