David, the 0813165 on my engine and the 0841486 on yours are the "production engine number" or "engine serial number". From what I understand, and hopefully someone will confirm or correct, this was a running count of the V8 engines produced since the first one (1955?)So, like on yours, it was the 841,486 pontiac V8 made. Now maybe that's wrong, because why, since our blocks were produced only 8 days apart, would our serial #'s be 28,000 apart? Again, hopefully someone will chime in with some concrete answers. I also have the copy of the order form (invoice) from PHS for my car. There is nothing on there as to the engine manifest code (YS in our cases) on it. I don't have my build sheet so I can't comment on what would/should be on it.
Goathead 68, my #'s matching heads on my 69 are 62's. I saw in the Gto Red Book that they said 400's with AC only would have the 62's. My car did not come with AC. Guess there is always exceptions. Jeff
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