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What size motor was in a 55 Pontiac chieftain?

The 1955 Pontiac Chieftain offered several engine options:

* Strato-Streak V8, 230 cubic inches: This was the standard engine.

* Strato-Streak V8, 287 cubic inches: This was a more powerful optional engine.

Therefore, there wasn't just one size. The answer depends on the specific Chieftain model and options selected by the original owner.