As the ratio goes up the push rod cup gets moved closer to the rocker stud.
If you had let’s say a ideal geometry working with a 1.5 rocker and you switched to 1.65s which moved the cup .050” closer to the stud, then a .050” longer push rod should get you back to having hood geometry.
The bad thing once you get above a certain ratio is that the cup will be getting real close to the trunion and with enough spring pressure and cycles that’s where the rockers will break.
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