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roblav roblav is online now
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Join Date: Mar 2005
Location: KY
Posts: 1,071
Garage
The performance difference between 34 and 36mm venturis is minimal. One engine I built up 25 years ago was a 2.7RS (big valves / ports, S cam) with Weber 40 IDA and 34mm venturi. It was a fun engine.

I have a very old Weber Carb book with graphs in it with venture size based on max HP RPM and cc/s per cylinder. There's no lines! Only wide slices.

IMHO, you're better off with the smaller 34mm venturi.
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Old 02-28-2018, 06:00 AM
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