The rise in rpm surprised me too. Hey, I'm at a loss in explaining any of this stuff, just reporting what I'm seeing.

Originally Posted by fast68plymouth
Obviously iiwii....... and if it’s working good that’s really all that matters........ but it seems really odd to me that adding 003” to a .066 hole(+.0003197sq/in)in an idle air bleed would change the idle speed by 300rpm.