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SU HIF6 needles 444-544

Can someone advise which needles should be used in twin SU HIF6 carburettors on a standard B20F engine when K&N filters are mounted? At this moment BAL needles are fitted, but the carbs came from a B20B (‘71 144) and that's not quite the same as a B20F.
Around 40-55 miles steady speed there is a slight hesitation, so it’s obvious these needles are not ideal.
A rolling road session would be the best way to determine of course, but also the most expensive....









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