Found this data in a Sealed Power catalog that can be helpful. It lists(2) pistons as replacements for the 250.

L2314F- C/H is 1.672,Flattop w/4 reliefs and a volume of -2.5cc and also a -.025" deck height.

L2396F- C/H is 1.655, .073" dish and chamfer with a volume of -11cc



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