I'd recommend avoiding the Fram and other common U.S. filters on LBCs as a
general rule. Unless you get their special "heavy duty" or "racing"
application, they are typically made as cheaply as possible. Original spec
English filters, or, believe it or not , some Japanese built replacement
filters will typically weigh 2-3 times more, and the difference is in how
much filtering material is in the filter, and whether or not the orignial
anti-backflow valves and the like are actually there.
Dissect a filter or two and you'll see what I mean.
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