If i remember correctly,153 has forged connecting rods and the U.S.151 has cast rods.I have read export 151 enginges have forged rods.As far as cranks interchanging,i don't know.Also there was the 151 engine that did not have a crossflow head like the later ones.We use to put those in vegas,when the Vega motors died.
EvilDr235
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