Pyrorocketeer Posted November 9, 2006 Share Posted November 9, 2006 They usually measure how well they flow at set increments Lift @ Valve Flow @ 25" .100 71 .150 94.3 .200 117 .250 139 .300 161 .350 183.2 .400 204 .450 222 .500 237 .550 246 .600 256 .650 261 .700 270 Link to comment Share on other sites More sharing options...
..SSR.. Posted November 10, 2006 Share Posted November 10, 2006 With imports it is done at 28" of water. I'm not talking about cam flow. Make a head flow 300CFM at .500 lift when your cam only has .100 lift doesn't mean your head is flowing 300 CFM with the cam in it. Link to comment Share on other sites More sharing options...
cranny Posted November 11, 2006 Share Posted November 11, 2006 thats exactly what i was saying. ratings are only good if you use the exact gear used for rating it. Link to comment Share on other sites More sharing options...
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