Nel 1965 una delle 4 OT 1600 venne smontata e riassemblata col motore 1946 della Simca Abarth 2000 GT corsa, 206 HP e 252 KmhFiat-Abarth OT 1.600 - Foto Pinterest.com - carsthatnevermadeitetc.tumblr.com
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<Fiat Abarth OT 1600 Mostro, 1964. An extreme variant of the modest Fiat 850 which was shown at the Turin Motor Show, with a 155hp 1,592 cc twin cam, twin spark engine from the Fiat-Abarth 1600 Sport racing car giving the Mostro a top speed of 137mph>
Ovviamente rimase un esmplare unico.