The 421 Super Duty sits at the center of Pontiac lore, yet its relationship to the Bonneville nameplate is far murkier than many enthusiasts assume. Collectors often talk about “Bonneville 421 Super ...

We’ve all heard the story of the little engine that could. Well, the little engine in our story isn’t so little and packs a great deal of muscle for something from the mid-’60s. How about a 421 SD ...

Myriad hobbyists fantasize about owning a Super-Duty Pontiac in their lifetime. Some might prefer an SD-421 Catalina from the early '60s, while others may fancy an SD-455-powered Second-Gen Trans Am.

Q: I have a 1963 Pontiac 421-SD that I am rebuilding. I have been told that I can switch out the SD rods for Chevy 427 high-performance I-beam rods. Also, I am building a '72 455-HO, and again I've ...

Mileage changes a vehicle’s value. The default value is used if mileage is not entered. Price with Standard Equipment Standard equipment includes the features that come with this vehicle. Select Your ...

Mileage changes a vehicle’s value. The default value is used if mileage is not entered. Price with Standard Equipment Standard equipment includes the features that come with this vehicle. Select Your ...