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500 CFM is way big for a stock 258. Holly has a calculator at their web-site, but I just checked and it is "under construction".

I checked it some time back and it said a 258 needs 300-350 cfm. If you go too big you'll be fouling plugs and wasting gas.

Loose nut behind the wheel
Another right-wing conservative.....
Born and raised in Jeep-Town
 
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