Quote:
Originally Posted by WorkinProgress
There are two '291 head castings. The small block is 3917291 and a big block 3964291.
Not sure if your COPO engine would use the 3964291 or 3919840.
- Warren
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Did not know that there was a small block 291 head....another day learning something! Several other COPOs from late September that I've seen or are known to be doc'd originals all had 291's. Mine has 840's on it now...March and May dates I think.