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I bet you could do this in a VTEC or other sliding / adjusting cam engine by making the secondary lobe wholly round on the exhaust side, so when it slides over it just opens the exhaust port. You could knock a 4 down to a 3. VTEC engines are pretty easy to adapt to a flip-switch situation, rather than driving off of RPM as they come from the factory.
The cost will be in the head.
How is a ZETEC engine? is it variable cam timing or a moving cam like in a Mazda CCV?
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