Richard Holdener to test the Piston Reversal theory

rumblefish360 said
Today’s machining and materials are much nicer. But even in the early days of machining they could get things to fit amazingly well. The biggest advancement for engines was the aluminum/copper piston.

Oil certainly has come a long way as well as EFI. Nothing like cracking open a Magnum w/80K plus and seeing crosshatching.
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Merlin engines license built by Packard (only US company that Rolls Royce found worthy tolerance wise at the time!) had machined parts handled with gloves and stored in paper to prevent fingerprint oil from getting on them. Some tight tolerances indeed.