Thread: MPG for a 402
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Old 08-19-2009, 10:12 PM   #58
'72customdeluxe
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Join Date: Jan 2008
Location: Tejas
Posts: 691
Re: MPG for a 402

With the stock motor and Q-jet, along with 3.73's that help me out around town, maybe 14mpg if i'm driving nice. Running 3000 rpm at 70, not so much. Getting rid of my ramhorns and downpipes crimped to 1.5" or so each should help it breath alot better at speed. Going to Hooker long tubes and a 3" otl single with an xr-1. Along with my summit velocity stack look cotton gauze air cleaner in the mail to replace the stocker snorkel. I really want to get a wide band to get it "just so". But as much as I like my q-jet, a coworker of my dad's is giving me a free thunder avs and they're 1000X easier to tune.
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'72 cheyenne super step, '05 long bed gmc
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