What v8 weber ir engines had air cleaners?
Look at the cam timing on 4 and 6 cylinder engines with ir induction. Which ones have overlap in cam timing? Which ones have 28 or more degrees of cam overlap?
You won't have enough reversion at 28 or under to have any blowback.
You actually can run the air cleaners on a stock cammed 351c because of the cam timing. You won't get much benefit because of the low valve lift but you won't get any blowback either.
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