plenum butterfly

[cazzz12000]

Hi people,have had a bit of a search around but can't find it.Is the butterfly in the top section of the plenum chamber supposed to have a air gap or fit snug?.I know i've read this some where but buggered if I can find it.As always your help is much appreciated. Zacc Edit: D1 3.5

[BigJon]

Air gap.

I usually set them by putting a slip of paper in and seeing if I can pull it out with the throttle closed.

[INDIE2002UK]

From memory it was 1.5thou to 2 but that was on the old 3.5 system not hotwire, i do have a tuning book buried deep in the shed somewhere?