The stock flow numbers were taken from
http://www.pinn.net/~nascar/fordhead.htm
I would guess that the small differences in the low-lift flow could be accounted for in small testing changes between the two environment and flow benches.
heres a few shots of the heads:
this is a shot of a felpro 1415 exhaust gasket on the heads.
heres one with 1 exhaust ported and 1 not, HUGE difference
another exhaust port shot
and here's a shot of one of the intake ports matched to a 1250 gasket
thanks again Tim
