Join Date: Oct 2004
Location: Deliverance, GA
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Royal Pontiac in Royal Oak, MI. offered a dealer installed 421 and it would not be uncommon for the block to not have a letter code because the engine was not available from the factory in the GTO.
Check the PHS for the Dealer's name, if it was from Royal Pontiac you will have a rare car.
Ace Wilson's Royal Pontiac was Pontiac's version of Don Yenko's high performance Chevrolet dealership in Canonsburg, Pennsylvania.