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  1. What size fuel lines 550hp 400 chev

    Engine
    I already have 1/2 copper fuel line on my ute that the holley blue is pushing thru. I have a bg220 pump which requires a bypass line. Have just purchased a mallory return reg #4370m which states for pumps over 200gph they need a 5/8 line? I would have thought 1/2 would be heaps? Also the reg has...
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