The California car is for sale, but the owner doesn’t provide a single photo of the engine bay; the ad doesn’t even mention ...

Catalina Super Duty 155 Grand Prix Super Duty Pontiac's 421 Super Duty is a 6.9-liter naturally aspirated V8 engine, built with a cast iron block and head design. The engine used a 4.09-inch bore ...

Enter Pontiac’s Bonneville Safari 421 Tri-Power High-Output of 1965. 1965 was the year when Pontiac one-upped Ferrari (again). Still, this time, the General Motors Division didn’t do it over ...

Prices shown are the prices you can expect to pay for a 1962 Pontiac Grand Prix 2 Door Hardtop (421) Super Duty across different levels of condition. Edit options.

The 326 was the inaugural base engine for the Pontiac Firebird's debut, supplying it with 250 horsepower, which was impressive at the time. The 421 would become renowned after being used by Joe ...

Prices shown are the prices you can expect to pay for a 1963 Pontiac Tempest 2 Door Coupe AFX (421) S/D Aluminum Front End across different levels of condition. Edit options.