This page: http://www.triumphspitfire.com/weber.html lists links to Weber
Carburetor resources for Spitfire and GT6's. I haven't followed the links,
but there are quite a few.
This one: http://www.prolinefuel.com/faq.html mentions tuning air flow from
200-400 cfm by swapping venturi sizes. The picture shows top mounted air
filters, and from here: http://www.carbs.net/CarbID/weberID.htm they look like
DGV's to my non-Weber eye. The same site has a CFM calculator for engine size
here: http://www.carbs.net/Calc.asp which indicates that a 152 cu in motor in
stock trim running 5000 rpm needs a flow of 186 CFM.
Hope some of this helps
Pete Logan
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