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Originally Posted by MPGeo
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But if removing the pistons is out of the questions then I would remove the valves for those unused pistons, and instead of welding anything shut I would leave both intake and exhaust ports fully open to the atmosphere. Simply because that would create the least amount of power loss, but this would require modified manifolds... Or I would remove only the exhaust valve so that I can still use my factory intake manifold without any modifications and only have to deal with the exhaust manifold... and this would do what you stated, pushing and pulling air out of the exhaust port.
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I disagree. This way, OP will still get pumping losses. Plenty of manufacturers offer systems to close valves completely and quit firing several cylinders when cruising at low load, because the air inside acts as a spring, rather than simply sapping power by being pumped through.
https://en.wikipedia.org/wiki/Variab...der_Management