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Longer rods increase the side loading on the major thrust surface of the cylinder bore.
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It's the R/S ratio that affects the side loading. It increases with SMALLER R/S ratio. (R/S - Rod length to Stroke length)
Higher R/S ratio makes for higher RPM with less loading.
The R/S of a 455 with stock stroke of 4.21 is 1.57, pretty bad.
The R/S of a 455 with same stroke and 6.8" rod length is R/S of 1.62, still probably bad but better than 1.57.
The R/S of a 4.151 bore and 4.25 stroke with 6.8 rod length is R/S of 1.60, which is better than stock 455 and bigger cid.
And, if the 4.25 stroke crank is used with the 6.625 rod - R/S of 1.55, really bad?
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John Wallace - johnta1
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