I like to use the green PG. The clearance I've always tried to get is .0015", which is in about the midrange of the green stuff. Red is slightly thicker, and the blue is WAY too thick to be used for bearing clearance. Rod bearing clearances larger than .002" have a tendency to rattle a little on startup until a good film of oil gets established between the rod and the crankshaft. Main bearings work best somewhere between .0015" and .002" also.

There's a procedure involving Prussian Blue indicator paste and scrape-fitting Babbit rods to establish a perfect fit between the rod and the crankshaft before shimming for clearance, but it's usually used when fitting new or reconditioned rods to a used or reground crankshaft. If the rods in your engine have been run against the crank for some time, that's probably not necessary.
Jerry


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