Re: Oh you didn't!
Yes, you're right, the 400 ram air was the biggest engine in the first gen. birds,..ram airs III and IV. The second generation had the 455 as the optional engine. So, he had to get a 421 from another Pontiac model to put in this car. But, no matter how he got it, the 421, especially the super duty in the 62/63 Catalina are really sought after mills.
If I remember correctly, there was a 62 Poncho Catalina, a light weight car with aluminum body panels and plexiglass windows that turned mid 12's with this 421. The engine was rated at 405 hp. I think there were even 426 c.i. versions rated at 425 hp, but not many.
I think the 421 was also available on the 65 Catalina as a base engine and with an HO option. I don't think it made as much hp as the earlier SD versions.
The engine experts on this site I'm sure know more than I do about the 421.
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