Question came up in another thread so I am starting a new thread to continue the discussion without hijacking the original thread.
Here are the pages from the Pontiac Chassis Illustration and General Information Catalog for engine options. 1967-1968-1969.
One of the columns shows the last two digits of an engine number. I checked the EUN from my car and it doesn't match the last two digits shown on the chart.
Any idea what those two digits are used for?
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