3. 1968 Pontiac Firebird Sprint
Since 1968 was the height of the muscle car era, the public paid attention to high powered V8 models. However, Pontiac managed to sneak an interesting model into its lineup. The secret of the Firebird Sprint was the engine. It was a 250 CID straight six with a single overhead camshaft. It produced 215 HP in the 1967-68 model years and 230 HP in 1969.
Compared to the 350 and 400 CID V8, this was not impressive. But the Sprint six had serious torque, a small weight and revved happily to 6,000 rpm. Compared to those nose-heavy V8 models, the Sprint was light, which provided balanced handling and great driving dynamics.
In the days of V8 monsters, a six-cylinder Firebird had an almost European feel. Unfortunately, not many people understood this model. Despite the modest price and unique characteristics, they only sold a few thousand in the three-year production run. Today, the Firebird Sprint is a rare sight in the six-cylinder muscle car category.