I just finnished having the 177 or 174 installed in my 55 on a 383, its the 10 rib belt must have been the 174 and i thought the specs were in the holley web site for the b&m blowers.
I remember the speed shop that did my work had a book with the specs as well.
But it did fit under my hood using a 4 inch off set breather cover.
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