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Old 07-19-2012, 06:58 PM
67pontiac400 67pontiac400 is offline
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It's got a Yn code in front next to timing cover under passenger side head. 3 freeze plugs tell me the block 67 and up but 2 motor mount bosses mean it might be pre 70. Date code ends in a 7. Valley stamp says 50. Usually a 350. My paperwork for the remanufactured short block says it's a 70-73 6.6 liter 400. I'm kinda stumped as to why things aren't adding up. Pistons are stamped .060 over
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