There should be a 6 or 7-digit number on the crankshaft somewhere, for instance:

3.813 strokes

2144958
2191127
2195570
6107430
6107432

4.00" strokes

2090911
2135416
2136119
2192411
2194012
2195958
2326229
2342204
234224
2342664
2404929
2491012

There might be other forging numbers, but that's what Federal-Mogul lists. To get an accurate measurement on the stroke, the crankshaft and at least one piston would need to be in the block with the bearings in place.
Jerry




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