Tolerances?

[Sinister]

This may be a dumb question, but when I've built engines, I've used the tolerances in the Haynes manual for assembly. What do you guys recommend on this subject? I figured Haynes may be alright for a stock rebuild, but if going more hot-roddish should you have different clearances?

[gassersrule_196]

3 thousandths for a race motor on the crank and mains loose? yes but it'll make more power less friction