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Originally Posted by 767Jockey
Block - After removing the starter, I found two lines of numbers. The top line reads "D2AE-CA". Under that it says on a seperate line "2HI" or "2H1". I can't tell if the last character is the letter I or the number one.
Is the block 2 or 4 bolt main?
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From a quick internet search on the block casting #:
some 2-bolt blocks were manufactured from the same casting as the High Output 4-bolt blocks. Between 1971 and 1974 the production of 2-bolt and 4-bolt engines could have utilized the same casting (D2AE-CA) depending on what was delivered to the assembly line. This casting was called the Cobra Jet (CJ). In the case of the 4-bolt block, they were drilled, tapped, and stamped as a D3ZZ-A part number, were as the 2-bolt was not drilled or tapped, but stamped with a D1ZZ-A part number.