IRIS,
Yogi442 is correct. In 1966 thr Cutlass and F85 got the 330CID V8, the 442 got the 400CID V8 and the big cars got the 425CID V8.
Olds did not indicate the engine option in the VIN number. The engine code was stamped on the engine on the front of the right cylinder head.
It is possible that the engine is not the original engine and if what you ment by VIN is the engine code on the engine keep in mind that you will need the engine casting number and the engine code as Olds used the same codes from year to year.
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1966 Ninety Eight Convertible - 425 Tri-Carb, Factory Dual Exh, Switch-Pitch THM400, 3.54 Posi.
1966 Catalina Wagon - 421 Tri-Power, M21, 4.11 Saf-T-Trac, 8 Bolt Wheels
1989 IROC-Z - 5.7TPI
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