28* initial timing for a 318? How can that be?

Bewy said

92b,
The long-er rod engine has the piston dwelling more at TDC. So it needs less timing, all else being equal.

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How would you test that? How much longer would a rod have to be to see a difference? How much of a difference would it be? I think engine masters did a rod length test. I can't remember if they swept the timing on both rods to see if there was a difference in optimal timing. Anybody else remember or have a link?