Hi Po Engine Id Guide
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The block's casting number is found on the passenger side of the block above the starter mounting area. All '65-'67 289 blocks, including the Hi-Po versions, used C5AE-6015-E (or C4OE-6015-F for '64-1/2). This number alone does not make a 289 a Hi-Po; it just makes it a six-bolt 289 block cast after July of 1964 (or a five-bolt for June and July 1964). View Related Article
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