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3 - Higher horsepower ratings and new quietness and smoothness in two "Blue Flame" sixes.  Engines are of the traditional valve-in-head design, which in the last few years has won virtually 100 per cent acceptance by other makes.  A 123-horsepower engine is available with the manual gearshift.  The six built exclusively for the Powerglide automatic transmission now develops 136 horsepower.                                                                                                                               
4 - Integrated body and frame design. Chevrolet points out it has been able to obtain close unity with body and frame by engineering components to complement each other. An important reduction in vibration has been effected and weight saved. The frame is more rectangular and twist-resistant. With a scientific repositioning of mounts and the utmost application of rubber insulation, the body is isolated from road shocks to an unusual degree.

5 - Front and rear suspensions revamped. Added riding comfort and roadability, Chevrolet states, are assured by vastly improved suspensions. At the front, a modern version of the ball-joint design aids car handling and steering as well as comfort. One improvement new to the industry is a control arm geometry that cancels out most of the objectionable "dive" that often accompanies brake stops. The suspension also applies a new and more durable lightweight bearing material while the design decreases lubrication points from 16 to 4. Rear suspension improvements include leaf springs nine inches longer to an overall length of 58 inches. For stability, rear spring mounts are outside the frame, after the fashion of the Chevrolet Corvette.          

6 - Increased safety through greater visibility. Every car window of safety plate glass--front, rear and side--is larger in 1955 Chevrolet bodies. The gain is due largely to the extension of glass over areas that have been "blind spots" since the early days of the automobile. Increase in visibility through the sweep-sight windshield alone is 19 per cent. As another example of the improvement, glass area in four-door sedans totals an amazing 24.5 square feet.

7 - Optional overdrive. An overdrive installation will be offered for the first time. Engine speed reduction of more than 20% is accomplished by the overdrive which automatically cuts in when the foot is lifted off the accelerator above 31 miles an hour. Operating economy is better while reduced engine revolutions also give smoother, quieter performance. Less clutch operation in city driving is still another advantage. Optional overdrive brings to six the number of "power packages" available on each of 14 Chevrolet passenger car models.                                                                                      
8 - More electrical power. A 12-volt electrical system will furnish ample reserve power for the ever-growing demands of accessories. The system is standard on both sixes and V8s, assuring increased generator efficiency and higher starting motor speeds. Another safety feature is a dual circuit breaker. A short circuit or overload will as a consequence not entirely disable the system.

9 - "Dry Air" ventilation. This feature involves an archshaped plenum chamber that channels fresh air from a slotted cowl vent. Drainage from the chamber prevents any water from reaching passengers, even in rainiest weather. Cowl-installed and extended to the frame on each side, the plenum chamber acts as a structural brace as well. In addition, it is a perfect adjunct to an all-weather air-conditioner which Chevrolet introduces this year as optional equipment.                                                                                                                     
10 - Tubeless tires for increased safety. The casing remains the same, but instead of an inner tube, interior surfaces are coated with a butyl "skin" for sealing. Blowouts are resisted and deflation slower with punctures.                                                                        
11 - Smoother power application. The torque tube drive is replaced by a hotchkiss drive to deliver power more smoothly to the rear wheels and to provide a "flatter" ride in combination with the longer springs. According to engineers, the "work-out" of a new axle, springs and drive line, together with new engine mounts achieve a velvet-like transmission of power.                                                                                           
12 - Easier steering. From power steering, an improved version of which is available on 1955 cars, Chevrolet has adopted the recirculating ball-nut gear and combined it with a relay type of linkage that increases smoothness and reduces driver effort. A more rigid wheel coupling and truer geometry is also claimed.                                                                                                                                          
Most distinguishing mark of the new Chevrolet bodies is their low-slung silhouette and vertical windshield pillars. Broad, flat hood and trunk lids are approximately three and one-half inches lower than last year while the high, straight crown of the fenders enhances an impression of fleetness and agility. The design gives the cars the appearance of much greater length although wheelbases remain unchanged.

Brand new among 14 bodies on the One-Fifty, Two-Ten and Bel Air series are two-door station wagons. The complete line-up shows two- and four-door sedans in all series, two-door station wagons in the One-Fifty and Two-Ten, four-door station wagons in the Two-Ten and Bel Air, a utility sedan in the One-Fifty, a club coupe in the Two-Ten and sport and convertible coupes in the Bel Air series.

Even more appealing colors than the brilliant array of 1954 are available. Of 14 solid color options, ten are new. All 21 of the two-tone paint combinations are new except one. An interesting sidelight is a special two-toning option on   Bel Air convertibles and sport coupes which extends the top color onto the rear deck and quarter panels. Unusually luxurious interiors combine harmonizing colors and a variety of cloths and plastics.