1963 Chevrolet Impala Z-11
Pontiac was not the only GM division involved with drag racing on a full scale in the early ’60s. Chevrolet was also quite active, too. The SS package they introduced in 1961 with the fantastic and mighty 409 V8 engine was a popular choice for street and drag racers all over America. But for 1963, Chevrolet introduced the limited but highly influential Z-11 option on two-door Impalas.

The idea behind the RPO Z-11 was to introduce the best street/strip technology in one model. The first order of the day was to shed some weight by using aluminum panels, grilles, hoods, and fenders. The radio and heater were gone, and the interior lacked all unnecessary luxury options. The second order was to add power, so they added the new 427 with numerous performance updates and racing internals to the Z-11.

The power output was close to 450 HP, but some claim that it was closer to the 500 HP mark. Those Z-11 Impalas achieved regular 11.2-second quarter-mile cars, so they had a lot of power. Chevrolet built only 50 to 57 Impala Z-11s in 1963, and less than 10 survive today. The package was a kind of secret, so most people didn’t know the model was available. There were no brochures or dealer material, and only well-connected drag racers knew about them.