Don't try to reinvent the wheel- - - - -Measure the crankshaft diameter and buy the appropriate size bearings. Use an accurate micrometer- - -not a caliper, even a digital one. A .010" undersize shaft will have the following diameters- - - -four different sizes, getting bigger from front to back:


#1 (front) 2.6735-2.6745"
#2 2.7045-2.7055"
#3 2.7355-2.7365" (Thrust bearing)
#4 2.7665-2.7675"

"Standard" shaft diameters are .010" larger than the above dimensions. If your crankshaft does not measure within the above tolerances. you need to find a machinist who knows what he's doing and get the other guy's mess corrected, even if it means going to the next undersize. NO EXCEPTIONS!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!