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How can you find out if your 1965 Pontiac Bonneville with a 4 bbl Rochester carb is a 389 cid or a 420 cid?
Wiki User
∙ 9y ago
The common motor for '65 Bonneys was the 389 333hp for standard trans and the 325 hp for auto trans. There was a 421 4 barrell offered as well. Check for a 2 letter code on the front of the block. YK = 421. Other codes will be a 389. The block looks the same.
Wiki User
∙ 9y ago
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