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With rod knock you'll need a new crank and possibly new piston rods. $200 you're paying for the head pretty much. A rod knock usually occurs when the rod bearing is spun and gouges the crank. Kinda impossible to machine something that has already been eaten away. You may not find a running engine for $200, but you shouldn't pay $200 for a ka head. I have an KA here with rod knock, and the machine shop said, "you'll need a new crank." So it's paper weight at the moment.
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