Hey Joe,
Where was your GTO built? That can make a difference in casting dates. If GTO was built in Pontiac, Michigan, designated by the "P" in the VIN#, the casting dates will usually be within a couple weeks of the body build date. The Pontiac Plants in Pontiac, Michigan were in a sprawling complex. The Fisher Body Plant was across the street from Pontiac Assembly (known as Plant 6). Cars were shipped via conveyor on a bridge over the street from Fisher Body to Pontiac Assembly. Next door, in a connected building was Pontiac Engine Assembly (known as Plant 9). All the Pontiac engines at this time came from Plant 9 in Pontiac, Michigan. If your GTO was built in Baltimore or Kansas City etc., the casting dates will need to be more than a month prior to the build date of the car due to having to ship the engines to these plants from Pontiac, Michigan.
My 66 GTO was built at the Pontiac Plant and has the original engine. Engine casting date was K 10 5 (November 10, 1965) Both 1966 093 heads are K 13 5. The Intake Manifold was K 8 5. No readable casting dates on the exhaust manifolds, only part numbers. So all cast engine parts were very close in casting date codes.
The body build date for my GTO was 11 C 2 (November, 3rd week, 2nd shift) on the Data Plate and 11 22 5 on the PHS Billing History. This translates to November 22, 1965 2nd Shift.
So the earliest casting date was November 8th (Intake Manifold) compared to the body build date of November 22nd. A total of only 14 days apart.
Maybe others with GTOs with their original engines that were built at the other plants can provide their casting date and body build date info. Good luck in finding your parts! Jim
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