Terry,
Its important to consider flow at various lifts and compare the combined
"area under the curve" numbers when doing the comparisons. Remember, the
valves spend more time at low lifts (and lower flows) than they do at max
lift, which is where most numbers are quoted. Particularly at the shorter
tracks like Maxton or the dry lakes acceleration still pretty important.
My heads (Hemi-Design, Sportster based, www.hemidesign.com) were provided
with charts showing 9 separate flow parameters for each lift of .100",
.200", .300", .400", .500" .600" and .650" lift and curves for baseline and
modified. From that you can get a much better view of overall efficiency
than with simply max flow numbers.
My flow numbers show improvements of about 2 CFM at .100" and increasing to
40 CFM at .650". Its difficult to find modified heads that don't sacrifice
anywhere, but these guys can do magic. Unfortunately, they only do H-D
heads.
Good luck with your project.
Dale C.
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