I'm going to go out on a limb here and speculate that the valve came from an engine that had 4 valves per cylinder and the pistons were at least 350 mm in diameter probably idled around 300 RPM and ran at no more than no more than 1000 RPM under full load I won't speculate on the number of cylinders since it could have been anything from an inline 6 cylinder to a 24 cylinder "V" type How far am I off?

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