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as high a compression ratio you can possibly get away with.
due things like deburr the combustion chamber to run higher compression.
disable one intake valve.
run lower ratio rockers.
I've thought about trying to run .100 rocker clearance, but it might be hard on valve stems.
every serious mileage vehicle has HUGE compression.
consider building a custom tune which gives LOTS of fuel when MAP gets anywhere near atmospheric, and running even more compression.
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