A few years ago there was a magazine article where someone was
offering CNC ported 906 heads. I believe it was Muscle Motors.
As I recall they were reported to flow something 312cfm on the intake
side. I've had a set of those in the shop, just as delivered from MM
with 11/32" stem valves, 2.19 intake and 1.81 exhaust.
Lift------in/ex
.100----68/61
.200---145/109
.300---241/145
.400---256/171
.500---284/191
.600---290/204
.700---288/204
.800---290/205
On my bench, while not 312cfm, that's still a very good 906 head,
and as big as they looked, it was only like 217cc's as I recall.
I have an old article that explains that some of the well known Mopar ported head that you see for sale are advertised with flow numbers at 32 - 34. Not the 28 that most people are used to. I have had some on the bench and they flow around 275 280 at 28. Crank it up to 32 and they flow around 320.
