Glen....VERY roughly....
there is static balancing and dynamic
balancing, to "street" (good enough for
government work) and/or "race" (tighter
specs/tolerances in terms of what you
will "accept").
In static balancing (blueprinting), all parts
are evenly matched in weight/balance in all respects. These parts are assembled
and then the "rotating mass" is again
balanced "dynamically". This what you might do with a highly tuned and/or race
motor wherein you wanted that last HP or
lb. of torque. along with best service life,
all else being equal.
For normal street spec., only the dynamic
balance of the rotating mass is carried out according to whatever "acceptable"
tolerances the shop uses....there is no real
"blue-printing" or "static" work.
Sounds like the shop thinks statically "balancing" (blueprinting in terms
of weight and balance) the rods
will make up for the initial positioning error in terms of the "dynamic"
balance of the rotating mass.
And I don't know enough to know exactly
how what they seem want to do works into the entire dynamic equation, assuming
I've got all this correct.
However....
Bill Perry of Rivergate does engine blueprinting and balancing to race and
street spec and is very approacheable.
Cap'n Bob
"Street balanced" Frog
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