[442w30]

I don't know why they did things differently.

For example, the 289 hi-po Mustangs are "K" codes, but Comets and Cyclones are not "K".

Another one is from 1970. The CJs (both 428 and 429) on Fords have two codes dependent on whether they had ram air or not. A 428 is a Q without the induction and R with. But, for a Cougar, they're both Q and ram air was a seperate option that was not designated with a code. This counts for the 429CJ on the Cyclones - all were Cs but for a Ford, it's a C or J, respectively.