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Super Moderator
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One way is to look at the 5th digit (engine code) of the VIN, the lemans had a 350, the gto came with the 400 or 455.

H=350 (lemans)
T=400 (GTO)
Y=455 (GTO)
X=455 HO (GTO)

Request phs documentation on the vin, the Build Sheet Sales Code
is 334 for the GTO Option.
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