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It depends more on the condition and tune of the carbs than anything else.
I've used both HS6 and HIF6 on B20s and B30s and both work fine IF they are
in good shape. HS6 seems to me to be a bit pickier on float valve leakage
and also on wearing out throttle shafts and needing to be rebushed. HIF6 has
seals there so it is not as critical, besides which they are newer. Also the
HIF6 is harder to fit with aircleaners unless you use the rectangular box.
There is mighty little difference in either performance or economy.
--
George Downs Bartlesville, Heart of the USA!
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