The 360 build that has more turns than Willow Springs

Kern Dog said

It surprised me too. I remember hearing and reading that MP used "seasoned" (a fancy name for an engine pulled from a junkyard) blocks and bored them .020 over. When the machinist measured it and found standard bore, we all were surprised. We thought the used pistons might be worth something to sell but who ever needs a standard piston when doing a rebuild?

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There were many different variations of the crate engines and short block assemblies from Mopar.

Some were factory assembly line engines or short blocks right from the engine assembly and were typically standard bore. Any variation on these were simply regular assembly line over sizes. Those were mainly the ones sold as service replacements.

Then there was the many varieties that used aftermarket pistons. These were often .020' oversize bores. These were mainly blocks that I believe came back through regular dealer channels as warranty returns. These went back to different machine shops, not the factory assembly line machine shops.