how about building another lobe onto the intake and exhaust cams
plugging the spark and injecter ports
diverting the exhaust of the converted cylinders to the intake of the others
and grinding out the remaining two combustion chambers to drop compression back down a bit
all cylinders intact and doing work
much higher compression
or flip that idea on its head divert exhaust to the converted cyliners
inject some hot watter and you have a duble expantion on the same heat
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