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That's what Ford and Toyota did.
Grind the intake valve to stay open into the compression stroke. Viola! The power stroke is longer than the compression stroke and you have achieved Atkinson.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Hard Tonneau and Rugged Air Dam
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