1963 Chevrolet Corvair: The Monza Coupe was the most popular model with 151,738 produced out of 292,531 total Corvair passenger car production for 1962. The Corvair was fast becoming the darling of the sporty car crowd. Many aftermarket companies offered a vast array of accessories for the Corvair, everything from imitation front grilles to serious performance upgrades such as additional carburetors, superchargers and performance exhaust and suspension upgrades. One of America's most successful race drivers, John Fitch chose the Corvair as the basis for his "Sprint" models. They were created at his shop in Connecticut by adding various performance improvements along with unique styling touches. Individual components were also available through his mail-order business. Several Chevrolet dealers became authorized Sprint dealers able to install his conversions as well.
The 1963 model year saw the optional availability of a long 3.08 gear for improved fuel economy, but the Corvair otherwise remained largely carryover with minor trim and engineering changes. Self adjusting brakes were new for 1963. The Monza line was really proving its worth. Of all the Corvairs sold in 1963 fully 80% were Monzas. The Convertible model counted for over 20% of all the Monzas sold. Sporty image means big profits.
For 1964 significant engineering changes occurred, while the model lineup and styling remained relatively unchanged. The engine displacement was increased from 145 to 164 cu in (2.3 to 2.7 L) due to an increase in stroke; the base engine power increased from 80 to 95 hp (60 to 70 kW), and the high performance engine increased from 95 to 110 hp (70 to 80 kW). The Spyder engine rating remained at 150 hp (112 kW) despite the displacement increase of the engine. 1964 saw an improvement in the car's swing axle rear suspension with the addition of a transverse leaf spring along with softer rear coil springs designed to diminish rear roll stiffness and foster more neutral handling attributes. Spring rates could now be softer at both ends of the car compared to previous models. The heavy duty suspension was no longer optional, although all models now had a front anti-roll bar as standard. Brakes were improved with finned rear drums. The remaining pickup, the Rampside, was discontinued at the end of the model year.
Source: Wikipedia, 2012