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Desmodromic valve actuation is a maintenance nightmare. Also running two valve trains probably exerts more drag than stiff valve springs.
You probably could lighten up the springs if you slowed the engines down from the howling RPM most small engines turn.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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