Question for TomS. The only 61 421 dual quad sd Pontiac that I ever saw was Mickey Thompson's 61 Cat at the 61 Indianapolis Nationals. To the best of my recollection that was the only one there. The rest of the big time 61 Pontiacs were running the 368hp engines. Keep in mind that this was labor day of 1961 and the 62 model year was only a weeks away. In later years I heard that a handful of 61 421 engines were passed out to the "chosen few" racers but never saw or for that matter heard of another 61 421 car drag racing. Under those circumstances, I'm not sure that you or I could, at that time, order the 421 parts over the counter at your local Pontiac dealer.
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