[greenamex2]

Originally Posted by knighty

hold your horses guys, before you bin your webber carbs and spend a minimum of 2 grand converting to throttle bodies, you need to do one quick check......its with regard the the "big" dip in mid range power......you need to unscrew the brass cover just above each throttle butterfly......then count the amount of progression holes.......most webbers only have 2 or 3 progression holes.......the later webbers have 5 holes.......5 holes basically kills that notorious dip in power and makes your engine drive much better, the progression holes ease the transition from the idle circuit to the main fuel delivery circuit......5 holes delivers more fuel into the "dip"

WebCon (Webber UK) in Sunbury on Thames have a special drilling jig which thay can attach to your carbs and drill the extra progression holes.......do not attempt to do it yourself - as you will scrap the carbs for sure.......phone Alan Collins on 01932 750252 (Carb god at Webcon) and organise for your carbs to be drilled, cost is about £40 each I think......I know loads of people who have done this mod and have now forgotten about EFI and throttle bodies.......

Gotta be worth a try for £80!