heres some flow numbers from Ed Mosler on 64 401 heads and these numbers are pretty good numbers for a restrictive 401 head... Flow tested @28" H20. intake to exhaust ratio 75.9% intake .100 - 80.8 .200 - 144.6 .300 - 185.0 .400 - 221.9 .500 - 237.0 .550 - 243.5 .600 - 246.8 exhaust .100 - 63.0 .200 - 105.0 .300 - 138.2 .400 - 162.5 .500 - 175.6 .550 - 181.4 .600 - 188.2
here are some other nailhead flow numbers from a set of mild Gessler heads intake .100 - 62 .200 - 127 .300 - 171 .400 - 197 .500 - 212 .600 - 219 exhaust .100 - 48 .200 - 83 .300 - 108 .400 - 130 .500 - 138 .600 - 141
These are the numbers from a set of Steve magnotty heads intake .100 - 61 .200 - 121 .300 - 172 .400 - 201 .500 - 215 .600 - 223 exhaust .100 - 52 .200 - 93 .300 - 126 .400 - 141 .500 - 150 .600 - 153
last but not least.. stock heads stock unported heads intake .100 - 53 .200 - 110 .300 - 157 .400 - 180 .500 - 190 .600 - 195 exhaust .100 - 45 .200 - 77 .300 - 99 .400 - 114 .500 - 119 .600 - 120
#'s well heres the #'s for my heads on the flow bench i should get the sheets soon so i can post them on here if i get access 2 a scanner: Intake- .200-134 .300-190 .400-220 .500-237 .600-242 Exhaust- .300-127 .400-149 .500-162 .600-168 well i didnt get all the #'s cause i got them over the phone so ill have them all once i pick up my heads, anyway guys tell me what you think? good day ...