hi, i got a stock 91 civic si and i'm gonna put a gsr motor in it and i want to keep the ac. Will the d series ac bracket fit on a b series block or if not, will the d series compressor fit with an b series ac bracket?

 

you obviously didnt do any research. if you had you would have come to this answer:
you need to use an a/c adapter bracket on a b-series motor or possibly an a/c bracket out of a b16 crx/hb. and aslong as you have a sanden model compressor and a/c lines then the adapter bracket will work.

 

you can also use a crv compressor bracket because they use civic compressors

 

. Just get the bracket from hasport 160 buck keep the OG compressor very simple