[Geoff]

HWY,

So why is it 'wrong' If the roller is more to the 'outside'? Or more to the 'inside'?
What does it change? The actual ratio is changing during the cycle of opening & the valve. Smokey Yunick explains this well in his book.
In the usual attempt to get a narrow centered pattern on the valve tip, you need to change prod length. So what will THAT do?

The now defunct PE magazine did a test on different length prods with different rockers, testing how TOTAL valve lift was affected. Three prod lengths were tried & three rockers: 1.5 & 1.65 stamped & 1.65 roller tip
Advertised lift was 0.587". The measured lift varied from 0.521" to 0.592". The longer prod gave the highest lift. So working to get a centered pattern on the valve tip might require a shorter prod...& give less lift.
Crane brought out quick-lift rockers that had faster off the seat lift & they did this by lowering the prod seat.
Rocker geometry is complex & there is no right or wrong way.