373 horsepower
The engine is rated at 373 horsepower and features dual four-barrel carburetors, a solid-lifter camshaft, and high-capacity aluminum exhaust manifolds. The 421 engine is available only with related heavy-duty driveline components.

Is a Pontiac 421 a big block?

ENGINE: Looks like a standard Pontiac mill, save for the dual four-barrel carburetors atop the aluminum intake. Now factory-installed for 1962, the 421 used a four-bolt 3.25-inch main block, featuring a larger 4.09-inch bore, a 4-inch-stroke forged steel crank, forged-steel rods, and forged-aluminum pistons, and more.

When did Pontiac introduce the 421 engine?

1961
Pontiac was dedicated to its budding performance image when it introduced the 421 SD in 1961. The 421 SD engine option was a Pontiac 389 that was bored to 4.09375 inches and stroked to 4 inches, while the crank used larger 3.25-inch journals.

What is a Catalina 2 2?

The Pontiac 2+2 is a full size automobile that was manufactured by Pontiac, built on the B-body chassis. It debuted for the 1964 model year as a trim-only option for the Pontiac Catalina, with special door panels, bucket seats with a center console, and exterior badging.

Did Pontiac make a 400 big block?

In 1967, Pontiac took the basic recipe of the 389 and added a bit to its bore, creating the 400. With a 4.12-inch bore and a 3.75-inch stroke, Pontiac’s 400 had similar bore and stroke to Chevy’s big-block 396 (even when the Chevy actually displaced 402 cubic inches).

What cars did Pontiac make in 1965?

Bonneville.

Did Pontiac make a 400 small block?

The basic 400 continued through the 1978 model year, and the 428 grew into the 455 for 1970 when a 0.21-inch increase in stroke was added to its crankshaft. The 455 went away after 1976, and Pontiac went to work developing an entirely new small-displacement V8 whose total design was aimed at maximizing fuel economy.

What kind of engine does a Pontiac 421 Super Duty have?

Pontiac’s 421 Super-Duty engine debuted late in the ’61 model year as a larger version of the SD 389. Neither engine, however, was factory installed.

What is a 421 engine?

What was most interesting about the 421 engine in the beginning was that it was a dealer installed option only known as the SD (Super Duty) 421. These motors were built mainly for NASCAR or other racing purposes and were equipped with all the extra racing goodies that people were looking for.

How many Tempest 421 Super Duty coupes were built?

The Wynn Engineering Tempest presented here is one of the original six 421 Super Duty Coupes built by Pontiac. Four were destroyed and a fifth was recently found minus almost all the distinguishing special factory equipment, making this car the only complete example in existence.

What are the specs of a bobcat 421 SD?

Pontiac GTO Royal Bobcat 421 SD specs Car type Coupe Curb weight 1565 kg (3450 lbs) Dimensions 4.97 m (196 in) long, 1.80 m (71 in) wid Wheelbase 2.82 m (111 in) Introduced 1964