Classic/Antique Car Repair: Fitting Piston Pins-!939 Chevy 1/2ton, piston pins, auto machine

Question
I have recently purchased a NOS set of GM pistons with the bushings and pins fitted in them. These pins are much tighter than a thumb push as recommended by the shop manual. There is no way they could be removed without being driven or pressed out. Is this tight fit okay?

Answer
The piston pins should be fitted for a thumb fit when lightly oiled. If the pistons came from the maker with the pins in them, I would get the pins out, lightly oil them and check the fit then. If they still seamed tight check with an auto machine shop near you and have them check the fit.
Brad