Well here's your answer http://www.edelbrock.com/automotive_new ... _chart.pdfJSF55 wrote:Ah right ! the holleys and webbers are rated diffrently so 390 holley is actually bigger than a 500 webber, i read it somewhere !
Edelbrock 500 cfm ; aplication - 225 till 327 cid and don't forget the Ve (volumic efficenti) ratings of the engine which will be in the 75-80% range.