"another example : Chrysler SuperStock #308 castings 1.880/1.600 Valve Combo
with a 162.0cc max Intake Port - NHRA Limit
i spent 3 extra Days hand sanding Floor's epoxy shape to get to 285 CFM @ 0.750 Lift in a 161.5cc Port 1.880=Intake valve OD
so i dupilcated that Port shape in the other 7 Intake Ports
and because its a casting ... only that one Port=285 CFM , the others came out between 277 t0 280's
on the Dyno that 371cid lost HP and made Peak HP 100 to 200 RPM lower
ran slower down the Dragstrip , so from that point on , i gave my Customers around 260 to 265 CFM max in a 161.5cc Port at 4.94800 CenterLine Length
at 265 CFM at 0.750 Lift we set a bunch of National Records with 318,340,360 Engines