What are the specs, in millimeters, for the throttle body of a 91 2.0 Prelude? what engine code is that? cuz i don't think there is such a thing as an H20, but its not possible to be an f20. so idk... i'm very confused and would like to know what i'm talking about.

 

F20B its like the H22
and
F20C its from a S2000

 

Actually, the engine for the 88-91 2.0 Si was the B20A5. Much beloved and forgotten. it can also be called the B21A1, the only difference being is that the latter has a bore from 83mm to 85mm.