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You usually get the same HP with either stroke and the bigger the stroke the lower the rpm it will happen.
I like that you can make the same power at more reasonable rpm levels. Just my

Keith

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but also higher piston speed.

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You're right but think about it like this.. Let's say a 4" stroke makes peak power at 6500 rpm that's 72.2 ft. per min. Now put a 4.250" stroke in it ans say it makes peak power at 6200 rpm, that's 73.2 ft. per min. Not much difference huh. Will also have more torque to get the car moving. Less convertor and gear needed.

Rod

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Whatever a 4 inch stroke 4.06 bore motor will make at 6500 a 4.25 stroke 4.06 bore motor will make at 6112 or so and piston speed is even closer. You also get a lighter reciprocateing mass that translates in to faster ET