How can I tell a Chrysler slant six 170 from a Chrysler slant six 225?

Andrew

New member
I'm working on a 1964 Plymouth Valiant 4 door sedan, with a slant six, but there were two that year, the 170, and the 225. I can't tell which one is in this dang car.
Any help out there, or do I need to tear it apart to tell?
 
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