22" vs 26"

I agree with Rob and I also think that a 22" opening IS NOT NECESSARILY going to somehow restrict all additional airflow to the rad.

Unless "we" take one of these cars and engage in some expensive wind tunnel tests, there is no way ---for certain---to find out what the airflow actually IS


But "Intuitively................"

Let's say you have a nice big fan and shroud, which IS making a good try and pressurizing the entire core. With even minimal pressure INTO the front of the car, 30 -- 35 mph, example, you might just have a fair amount of pressure in the cavity formed by the 22" opening.

Yet another example is most any orifice in most any fluid / air system. The orifice is not necessarily "the (only) determining factor."

For example, if you were to have an air blow gun --that's an orifice-- and the end of a few ft of 1/2" hose, it would have "full tank" pressure at the backside, and the orifice in the blow gun would most probably BE the determining factor in limiting airflow

BUT if you were to take that same blowgun, and put it at the end of, let's say, 1/4" OD plastic tube say, 200 ft long, now the TUBING friction and size is going to be the limit, and the blowgun will unlikely have much effect on determining flow.

This is the same idea------even though you have a smaller opening, it's might not be enough to cause all that much effect.