And this from a fellow I know and trust:
Had many sets of nos SD piston/pin assemblies over the years and all were
exactly what you're saying. Always a different number on the pistons vs the
box. Near as I figured is Pontiac cataloged the piston/pin "assembly" a
couple digits different than the piston stamp number. I've had them in
standard/.010/.030 and all were unmatching stamped # to box part # but
always within a couple digits of the "bibles". FWIW. Bottom line is a single
trough forged 455 piston with "any" factory GM part number is obviously a
73-4 SD app.
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12.84 @ 106.89 with street radials.
12.63 @ 108.39 on drag radials.
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