Main Studs??

DJVCUDA said

my only concern is that i have seen many times a guy measures clearances at home and its off

Be it :

cheap tools
inexperienced hand
temperature change from home to machine shop

etc

mainly a machinist who has 30+ years knows how hard a gauge should drag to get REPEATABLE results all day, every day to obtain clearances in the thousands of an inch.

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All too true, and not to be taken lightly. There is a lot of "feel" required when you are in that range of measurement. My only point was to check it, or have it checked, and only machine something if needed. Bearing bores are in the ten thousands of an inch, 1/10,000 and .0005 total, typically. I've seen and heard of shops ruining, in my opinion, blocks by align honing and changing the centerlines between the cam and crank so custom timing sets are required.