then look down the choke, open the butterfly and count the holes, you might need a dentist-mirror and torch to help count em.....the later carbs come from the factory drilled with 5 holes......this was a modification that Alan Collins did at Webcon, the Webber factory in Italy heard about it, then converted their production line to drill all sidedraught carbs with 5 progression holes per butterfly, as it was such a good improvement to drivability.......but that was probably the last 2/3 years of production, year 2000 to 2003 ish - I'm guessing......so the vast majority of sidedraught carbs only have the old spec of 2/3 progression holes only - I cant remember the exact amount!.......how new are your carbs?.....
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