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Actually scratch what I said in last post ... I think the drilled holes allow more air in to change the mixture rather than to change vaccuum ... but hopefully I can tweak the secondary throttle stop...

Russ - thanks for info. I have a mechanical choke, so I can be pretty sure when it is fully off! However, I have picked up a Holley book "Super tuning and modifying holleys carbs" which says that if...

Gauge not pump, yes!! I have heard/seen about tweaking the secondary butterflies, so maybe that's where the issue is ... as the tickover screw is backed right off (i.e. is redundant) the only way I...

Hope noone minds me tagging another carb related question on the back of this thread ... engine not being running right, quick investigation and I found the accel pump needed adjusting and was only...