You can manually enter in flow numbers. I did that for about 2 dozen heads and they seem to mirror real numbers. AFR is dominating for the last few years, every head they make has better flow numbers for their port volume and best hp/tq.
Street car with valve lift under .450 : 180's
Street / strip car up to .600: 195's
Over .600 valve lift: 215/220's.
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