The Firebird Sprint had a hotter version of the inline six, featuring a four-barrel carb that helped bump power to 215 horses. Optional V8 engines included two different versions of the Pontiac ...

the W53 "Sprint," was another SOHC six with 215 horsepower, thanks to a hotter cam, high-compression pistons, dual exhausts, and a four-barrel carburetor. A bigger block V8 of 400 cubic inches (6. ...

Though technically not an official limited edition run in the Firebird lineup, Sprints boasting the OHC-6 are still pretty rare, with Pontiac moving an estimated 4,662 Sprint coupes in '68 ...

Pontiac introduced five models in 1967 — the Firebird, Firebird Sprint, Firebird 326 ... with a new T/A 6.6 (liter) V8 — Pontiac switched to metric measurements that year — that produced ...