The Jetstar 1 is a nice car. They are very rare. Olds only built them for 2 years (64 and 65). The Jetstar 1 (not to be confused with the Jetstar 88) shared engine and driveline with the Starfire. In 1964 it had the 345 horsepower 394CI engine and in 1965 it had the 370 horsepower 425CI engine. There could be any number of reasons your car has a 425:
It may have been replaced with a later engine.
Your car may be a 1965 not a 1964 (model year and Manufacture year are different).
You may have been misinformed about the engine size.
The 330 came out in 1964 and the 425 (along with the 400) came out in 1965.
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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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