@latehemi - I read your combo on the other thread - a beast!
But.......a 392 at 7000 rpm requires around 131 sq" of filter area.
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If you want to measure the perimeter (circumference) of your air cleaner and your height, I'll do the math and work out how much filter area you have......it looks like it might be a little small.
Or..do it yourself.....You can measure the perimeter by running a piece of string around the outside of the filter and then measure the total length of the string....then X by the height = sq"