The master cylinder I got from the wrecking yard has mounting holes on 3-1/4" centers, but my power brake booster has mounting bolts on 3-3/8" centers. Are there both 3-1/4 and 3-3/8 master cylinders, or is my new booster made incorrectly? Thanks
Yes. I changed masters on an '87? Ford PU and master was big $ so I went with one year earlier and just elongated holes with a carbide burr.