I have a really old Haynes Manual with some cam information and it has the same difference for 20r/22r vs. 22re. The cam I have in. my 22r now is the stock EFI profile because that is all that is available as a stock replacement these days.
I measured an original early 22r cam vs. a 22re cam and it did mic out a little bigger on the intake side if that means anything. Biggest difference if this is all true is the difference in the duration intake/exhaust. That has to do something big.
There are some cam specs floating around on the factory stock 20R, 22R, and 22RE. The factory part number is the same for all three.... and as far as I know, the cam specs and profile is the same for all three.
There are "rumors" that the RTE (turbo) cam has a different duration to reduce valve overlap to avoid potential boost loss.... I don't have any specs on that rumor.
Gnarls.
