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On my 3.2 powered 914 I have 40's with 38mm venturis
On my 2.2 powered 911 I have 40's with 32mm venturis
both engines are responsive and pull hard from idle to redline (7200rmp and 7600rpm respectively)
You can use 46's with smaller venturis on small less extreme engines, but the initial cost of the 46's is tremendous. The 40's work fine on all but the large displacement rad cammed engines
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'69 911 GT-5
'75 914 GT-3
and others
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