Holley 600 secondary adjustment screw

iw378 i Fill you pain! the primary can be set to a square, no problem! the secondary is a little different. there is a vary small hole drilled into the bore and a vary small slit for the idle transfar slot. Setting it square just don't apply.

I played this game for a while and then gave up and drilled small holes in the primary butterfly in the end to get the idle screw to come in to play.

Set the front to a square and the back 1/4 turn and try it!