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Not quite sure for intake manifold port size on the S code? but I'am sure it would be close to the head port size of 1.93 X 1.34" Now as for the RPM.... One of the other Guys should have that?
The "S" intake is the smaller ports for increase intake velocity. Thats why they ended up changing them all to it. Prior to the S intake the ports were 1.34X2.34. As far as I know there is only one FE intake with 2.20 X 1.14, thats the 427 8V and 4V low riser used from '63 to '65.
bear, I don't have that book so I can't talk about it but ford interchange, ford performance, steve christ all have errors.
Hey can you look up these part numbers?
390 gt intake c6ae-9425-G
428 cj intake c8oe-9425-c
I measured a 2bbl T and got 1.78 by 1.13 +/- .03, but thats all I got for actual measurements right now and I assume my 4bbl T intake to be similar to the 2bbl one.