Throttle body flow rating

[1985C10]

I was just curious what the flow rating is for the #3869 throttle body. My best guesstimate would be 1100-1200 cfm, considering the 90mm throttle blade has slightly more area than four 1.75" throttle blades and there would be considerably less flow lost to bore shrouding over a four barrel design.

[CE_BRENT]

Our PN 3869 flowed 1050 cfm with a PN 3849 90° race elbow between it and the flow bench (at 20.5 in H2O), so I think your estimate of the throttle body alone is pretty accurate.
We used 20.5 because that is the standard pressure drop for a carburetor.