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Back in the bad when I worked at a machine shop it was common to stroke an engine. THis is grinding off the back side of the crank journal so the rod move up and down more in the cylinder. Then again these were engines made right after the non leaded gas revolution so their compression ratio was like 8 to 1 and we bumped it up to 9.x to 1 or as much as 11 to one. Makes a hell of a different in torque, acceleration and the heat an engine will produce.
For the smaller "rice burners" they just decked the head a few thousands.
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