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New for '55 was a 287.2 cid , the first overhead valve for Pontiac.

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Q: What size motor was in a 55 Pontiac chieftain?
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What size Tire do I need for a 1955 Pontiac Chieftain?

Check out: http://classiccardatabase.com/ Look up Pontiac 1955 then select your model or for the Chieftain and scan the data under tire/wheel size. Good luck! 55 Poncho Guy


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The Chieftain was a model designation for Pontiac. As an example, Pontiac manufactured, in 1955, the Pontiac Chieftain model 870 deluxe series,which, as a 2 Dr hdtp would be called a Catalina. It had a 287 cu in V8, single exhaust, 2 bbl Rochester carb and was on a 122" wheelbase. There was 72,608 of these units made in 1955 in the USA. Canada produced a different model called the Pathfinder and Laurentian which, if was ordered with a V8 would have been the 265 cu in engine. Hope this helps. 55 Poncho Guy


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