I am leaning towards that to, but:
1. Why is there no mention of a pr4-3 head anywhere that i can find. If you look at my earlier post, you can find info on PR4-0 through PR4-4, EXCEPT no one mentions a PR4-3

2. If it is a pre-92 b18a head, and supposedly the IM bolt pattern is supposed to be different?, then why does the supercharger fit? OR, is that not a correct statement the guy from hondatech made about the bolt pattern being different?