Alright banger brothers, need a little clarification... I'm working on a hopped-up A motor and have procured a Brierley cam (SU-1R). Mr. Brierley recommends 60# seat pressure for this cam, so I'll need to add spacers to get there. Problem I'm running into is that I'm seeing different #'s for installed height on an A (some sources say 2.5" others 2.375"). I understand that the springs Mac's sells come in at 37# at 2.5" and 50# at 2.375, so I probably need to be in the ballpark of 2.25" for 60# with those springs. Can anyone provide the correct installed height so I can verify what thickness spacer I'll need? All help is appreciated!