Here is a flow test of the Pro Comp 210 heads (unported) vs. the smaller port/valved AFR 185:

ProComp (independent test):

Intake Exhaust
.200 103 101
.300 140 136
.400 179 169
.500 218 172
.600 244 170

They were flowed using 4" bore, 1-7/8" pipe on exhaust, and 1/2" intake radius, .28 H2O, on a SuperFlow600 bench.

AFR 185 (independent test):

Intake Exhaust
.600 291 211

SuperFlow600 flowbench with a 4.030" bore, 1 3/4" pipe on the exhaust. No additional head porting. No other data given for other lifts.

Standard AFR 185's from AFR website:

Intake Exhaust
.200 129 116
.300 189 153
.400 234 178
.500 267 185
.600 277 191

28" of H2O, 4.060" bore, 1 3/4" pipe on the exhaust.

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Dennis
.
65' STANG (3330 lbs), 393W NA, Toploader 4 Spd, 4:11 TrueTrac, AFR 205's, Vic Jr. Intake, CI Custom SFT, 750dp, 11.0 CR

11.52@121.29mph