Tenney's 64 Wangers GTO...

[Tenney]

Jim Wangers told me the car went from the line to engineering over a weekend for the 421 HO install - then went to Royal to be "Bobcatted".

Per Jim, this motor was damaged in Florida during the C&D test, and replaced with another 421 HO upon return to Royal - again by Pontiac engineers.

There's a Royal receipt dated 11/17/67 (signed by service tech: "Milt") for the 428 that's in the car now. 9770716 heads built '63-'64, so could be original to the car?

Still curious if there were any others done. Jim says the blue car was a 389. That he also said so few knew of the 421 install in this car (three guys plus the two in engineering) - and the level of approval it took to make it happen - seems unlikely there are many, if any.