Re: 238 mph
The piston dwell at TDC and BDC are different.
The longer rod typically dwells longer, then accelerates to a peak speed passing thru 90degs to rod angle.
The shorter rod also increases the rod angle in relation to the bore which can introduce more side loading on the piston.
In fact, I worked on a "B" motor recently with 8" rods, it will be interesting to see it run.
J
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