1966 GTO 421??

[Bobcat]

PMD did not officially put 421's in GTO's for public consumption. There wer some GTO's bulit with 421 from the factory, BUT and that is a BIG BUT, the owners rearly know it. If the factory was short on 389's a it was not uncommon to put a 326 or 421 in to a car slated for some other engins. Ther was NO way the line was going to be stopped for somthing like this. It was common that an engine slated for installation would be pulled from the line by engineering just to test it for tollerances. This would disrupt the sequence for a few cars. Yes, there was a 1966 421 tri power. There were also dealerships that installed 421's as a commom practice. Royal Pontiac, MI, Packer Pontiac MI and FL and Myrtl Motors NY, Gay Pontiac TX, Colony Pontiac FL and others. Hope this helps