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Originally Posted by dandascott
Thanks. The engine block casting is 427-66 so I suspect the heads are also from 66'. .
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That may be just part of the mold, used for casting many engines of different sizes for many years. You need to check the date code on the block for the original casting date.
The heads have a date code as well, on the head, under the valve cover, there should be a date code.
the date code indicates 5-11-68 ( 8 E 11 ). These are 68 1/2 CJ heads that came from a 68 GT500KR.
Here's the matching intake, cast date 8 E 7, meaning 5-7-68.
