Drilling carb slides

[NoOne65]

When someone talks about drilling the slides what is drilled actually? I dont see anything called a slide in the manual. can anyone enlighten me on this?

[Mekanix]

Unless you are HEAVILY modified, I wouldn't bother. In race carbs, I used to drill holes in the butterfly valves to increase air flow at idle. This would prevent opening the butterfly valves beyond idle position and would keep from engaging other circuits at idle. The increased air flow would draw more air thru the venturi circuit, keeping air/fuel correct but the butterflies in idle position.

Sets big block idle at about 1000 and only used for racing.

[blackhawkxx]

I think you might be talking about enlarging the hole the vacuum pulls through to move the slide. I think the early models had smaller holes than later. I drilled my 97 per instructions when installing the K&N jet kit. My carbs run perfect.

[CxBXR]

I think you might be talking about enlarging the hole the vacuum pulls through to move the slide. I think the early models had smaller holes than later. I drilled my 97 per instructions when installing the K&N jet kit. My carbs run perfect.

Yes, this is what I assume also, to reduce the vaccum for jet kit, such as K&N, DynoJet mainly because of the larger jet needle & stiffer slide springs.

[SR71BLACKBIRDXX]

Yup..thats what they are referring to. Every jet kit is different though. Some may require it, some dont. When I put a jet kit in my uncles quad, they actually had you drill a second hole in the bottom of the slide.