1955 Buick Facts, Figures, and Specifications
Five Fast Facts You May Not Know
1955 – Styling Upgraded
1955 Buicks received a major facelift, with new rear fenders housing “tower” taillights, new front fenders and a new oval grille opening housing a textured grille panel and a large horizontal emblem bar distinguished the lines. V-8 compression ratios rose, adding power.
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1955 Buick Facts and Specifications
General Year Information – 1955 Buick Facts
1955 Buicks received a major facelift, with new rear fenders housing “tower” taillights, new front fenders and a new oval grille opening housing a textured grille panel and a large horizontal emblem bar distinguished the lines. The larger bodied Buicks were readily identified by their more rounded contours, straight up windshield pillars and sedan rear quarter windows. Power brakes were optional and tubeless tires were new.
Engine horsepower for the Roadmaster Super and Century was increased from 200 to 236 via higher compression ratios and freer flowing heads, and the Special model’s smaller V-8 benefited from these improvements to the tune of 188 HP. A new variable-pitch Dynaflow, in which the stator blades changed pitch under hard acceleration, provided quicker off-the-line getaway.
Roadmaster
In 1955, to distinguish Roadmaster, broad lower rear fender bands, gold-colored “Roadmaster” deck script and hood ornament, bars on the wheel covers, and a gold-accented grille were added. Back-up lights were now standard. All C-bodied Buicks were distinguished by vertical windshield posts and headlamp rims containing the parking lamp units as well. Roadmaster interiors were plusher, with 10 choices, including brocaded fabrics. The Model 76C convertible had a standard leather interior. Overall sales were 64,527. The Roadmaster Convertible replaced the exclusive Roadmaster Skylark convertible as the top model.
Super
In 1955 Buick’s popular Super continued to combine the large C-body interior expanse with medium bracket interiors and manual transmission as standard. Super models, like the rest of the line, had four of the new round Ventiports per fender. Additional “Super” series script was found on rear quarters and within the deck emblem. The side Sweepspear was unchanged from 1954. Inside, a new Red Liner speedometer lay horizontally across the instrument panel. Interiors were trimmed in nylon “Cordaveen” combinations, except for the convertible which featured leather seats. Standard Super equipment included trip mileage indicator, electric clock and, on convertibles, a power horizontal seat adjuster. Super sales rose to 132,463.
Century
The Century remained Buick’s performance line, with engine power rising from 200 HP to 236. Introduced in the middle of the 1955 model year, the four-door Buick Century Riviera was part of the first four-door hardtops ever produced. Century models were identified by their four Ventiports per fender, the “Century” in script on rear quarters, and that series designation within the deck emblem. Inside, damascene panels were inset into the instrument panel, and a quilted metallic door panel section was featured. The Century had the round “Red Liner” speedometer with a trip mileage indicator, unlike Roadmaster and Super models, who used a horizontal bar. An electric clock was also standard. Century continued to feature four Ventiports on the front fenders like the larger Buicks, indicating its engine status equal to the Super and Roadmaster, though using the shorter and lighter B-body.
Special
Special continued with the smaller 264 CID V-8, now developing 188 horsepower. Special Series script was found on the rear quarters and within the grille emblem. Cordaveen upholstery was used. The distinctive Series 40 and 60 instrument panel, with twin round gauge pods was continued. Introduced in the middle of the 1955 model year the four-door Buick Special Riviera (along with the Century Riviera, the Oldsmobile 98 Holiday, and the 88 Holiday) were the first four-door pillarless hardtops ever produced. By then, the Buick Special was one of America’s best-selling automotive series, and is credited with helping Buick rise to #3 in sales, overtaking Chrysler’s volume-seller Plymouth.
Historical
In 1955, the California Highway Patrol placed a large fleet order for 270 Century two-door sedans, a body style unavailable to the general public in Century models. It combined the Special model’s two-door sedan body shell with Century powertrain, of which 135 were fitted with Dynaflow automatic transmission and 135 had manual transmissions. Broderick Crawford was shown driving a two-door Century sedan during the first season of his popular syndicated TV series Highway Patrol. These Century two-door sedans were actual police vehicles owned by the California Highway Patrol and were loaned to the TV production company, but the real CHP door emblems were changed to a generic highway patrol emblem.
1955 Buick – Factoids
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- Skylark Custom Convertible Dropped
- High Compression Pushes HP Up
- Dynaflow Gets a Variable Pitch Stator
- California Highway Patrol Adds the Century to its Fleet
Production costs and low volume convinced Buick to drop the Skylark Custom Convertible. However, the car had seen a high impact for the brand, transforming opinion from staid and dependable to flashy, sporty and exciting.
Buick revised the cylinder heads and pistons for 1955, adding a larger exhaust valve, better flowing ports and increasing the compression ratio – 9.0:1 in the 322 CID V-8 and 8.4 in the 264 CID version. The result was 236 and 188 horsepower, respectively.

Adding a “switch pitch” stator to the torque converter allowed for better low speed response and solid high speed performance. This principle would later be adopted in Buick’s 2-speed Turbine 300 of the 1960’s – giving it the feel of a 3-speed automatic.
The California Highway Patrol placed a large fleet order for 270 Century two-door sedans, a body style unavailable to the general public in Century models. It combined the Special model’s two-door sedan body shell with Century powertrain, of which 135 were fitted with Dynaflow automatic transmission and 135 had manual transmissions.
1955 Buick Facts – Models Offered
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Special – Sweepspear moldings on the Special were the same as in 1954, but new round Ventiports were grouped by threes on each front fender. Series script was found on the rear quarters and within the grille emblem. Cordaveen upholstery was used. The distinctive Series 40 and 60 instrument panel, with twin round gauge pods was continued. Tubeless tires were now standard, as were directional signals, front and rear side armrests, sliding sunshades, a Step-On parking brake and heavy insulation.
Special models were 2 door Sedan, 4-door Sedan, 2-door Hardtop Coupe, 4-door Hardtop Sedan, Convertible and 4-door 6-passenger Station Wagon.
Century – Century models were easily identified by their four Ventiports per fender, “Century” in script on rear quarters and the series designation within the deck emblem. Inside, damascene panels were inset on the instrument panel, and a quilted metallic door panel section was featured. The Century had a round Red Liner speedometer with a trip mileage indicator. An electric clock was also standard, along with features found on the Special. Interiors were cloth and Cordaveen except for the Model 66C convertible, which was trimmed in leather and had power windows and a power seat adjuster as standard equipment. The California Highway Patrol models were based on the Special two-door sedan body, but from the firewall forward they were Centurys and Buick listed them with Century production. All had the 322 CID 236 HP V-8.
Century models were 4 door Sedan, 4-door Hardtop Sedan, 2-door Hardtop coupe, Convertible, 2-door Sedan CHP, and 4-door 6-passenger Station Wagon.
Super – Buick’s popular Super combined the large C-body interior expanse with medium-bracket interiors. Super models had four of the new round Ventiports per fender this year, with additional series script found on rear quarters and within the deck emblem. The side Sweepspear was unchanged from 1954. Super models were readily identifiable by their more rounded contours, straight up windshield pillars and sedan rear quarter windows. Inside, a new Red Liner speedometer lay horizontally across the instrument panel. Interiors were trimmed in nylon/Cordaveen combinations, except for the Model 56C convertible, which featured leather seats. Standard Super equipment included trip mileage indicator, electric clock and, on the Model 56C convertible, a power horizontal seat adjuster.
Super models were 4-door Sedan, 2-door Hardtop, and Convertible.
Roadmaster – Buick’s prestige car was given more distinction for 1955. Broad, bright lower rear fender bands, gold-colored Roadmaster deck script and hood ornament, bars on the wheel covers and a gold-accented grille were what set the car apart. Four round Ventiports were placed on each front fender of these Buicks, which were distinguished by vertical windshield posts and headlamp rims containing the parking lamp units as well. Interiors were more plush, with 10 choices, including brocaded fabrics. The Model 76C convertible had a standard leather interior. Standard features of all Roadmasters included variable-pitch Dynaflow, power steering, back-up lights, brake warning signal light, electric clock, windshield washer, Custom wheel covers, double-depth foam seat cushions, plus the features found on other Buick series.
Models available were 2-door hardtop, 4-door Sedan, and Convertible.
1955 Buick Facts – Engines
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- 188 HP 264 CID Special V-8 SMT
- 188 HP 264 CID Special V-8 AMT
- 236 HP 322 CID Super V-8 SMT
- 236 HP 322 CID Super V-8 AMT
- 236 HP 322 CID Century & Roadmaster V-8
264 CID 2-Barrel Special V-8 – Manual Transmission. Overhead valves. Cast iron block. Five main bearings.
Displacement: 264 CID.
Bore and stroke: 3.625″ x 3.20″.
Compression ratio: 7.5:1.
Horsepower: 188 @ 4800 RPM.
Torque: 256 @ 2400 RPM.
Valve lifters: Hydraulic
Camshaft timing: Intake 272°, Exhaust 292°, Overlap 67°, Lift (intake) 0.358″, (exhaust) 0.350”.
Carburetor: Carter WCD 2-barrel model 2179 or 2292; Some cars used Stromberg AAVB-267.
NOTE: Series 40 Buick Special Only.
264 CID 2-Barrel Special V-8 – Dynaflow Transmission. Overhead valves. Cast iron block. Five main bearings.
Displacement: 264 CID.
Bore and stroke: 3.625″ x 3.20″.
Compression ratio: 8.4:1.
Horsepower: 188 @ 4800 RPM.
Torque: 256 @ 2400 RPM.
Valve lifters: Hydraulic
Camshaft timing: Intake 272°, Exhaust 292°, Overlap 67°, Lift (intake) 0.358″, (exhaust) 0.350”.
Carburetor: Carter WCD 2-barrel model 2179 or 2292; Some cars used Stromberg AAVB-267.
NOTE: Series 40 Buick Special Only.
322 CID Super 4-Barrel V-8 Manual Transmission. Overhead valves. Cast iron block. Five main bearings.
Displacement: 322 CID.
Bore and stroke: 4.00″ x 3.32″.
Compression ratio: 8.4:1.
Horsepower: 236 @ 4600 RPM.
Torque: 330 @ 3000 RPM.
Valve lifters: Hydraulic
Camshaft timing: Intake 282°, Exhaust 292°, Overlap 67°, Lift (intake) 0.378″, (exhaust) 0.350”.
Carburetor: Rochester 4GC Model 7006200, or Carter WCFB 4-Barrel Model 2197 or 2358.
NOTE: Series 50 Buick Super Only.
322 CID Super 4-Barrel V-8 Dynaflow Transmission. Overhead valves. Cast iron block. Five main bearings.
Displacement: 322 CID.
Bore and stroke: 4.00″ x 3.32″.
Compression ratio: 9.0:1.
Horsepower: 236 @ 4600 RPM.
Torque: 330 @ 3000 RPM.
Valve lifters: Hydraulic
Camshaft timing: Intake 282°, Exhaust 292°, Overlap 67°, Lift (intake) 0.378″, (exhaust) 0.350”.
Carburetor: Rochester 4GC Model 7006100, or Carter WCFB 4-Barrel Model 2197 or 2358.
NOTE: Series 50 Buick Super Only.
322 CID 4-Barrel V-8 All Transmissions. Overhead valves. Cast iron block. Five main bearings.
Displacement: 322 CID.
Bore and stroke: 4.00″ x 3.32″.
Compression ratio: 9.0:1.
Horsepower: 236 @ 4600 RPM.
Torque: 330 @ 3000 RPM.
Valve lifters: Hydraulic
Camshaft timing: Intake 287°, Exhaust 291°, Overlap 70°, Lift (intake) 0.378″, (exhaust) 0.378”.
Carburetor: Rochester 4-GC Model (manual transmission) 7006200; (automatic transmission) 700910; or Carter WCFB 4-Barrel Model 2197 or 2358.
NOTE: Series 60 Century all transmissions & series 70 Roadmaster with automatic transmission. Not Available other Series.
1955 Buick Facts – Chassis Features
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- Wheelbase: Special and Century – 122.0 inches; Super and Roadmaster – 127.0 inches.
- Overall length: Special, Century and Skylark – 206.7 inches; Super and Roadmaster – 216.0 inches.
- Overall width: Special and Century – 76.2 inches; Super and Roadmaster – 80.0 inches.
- Overall height: Special and Century – 60.6 inches; Super 62.5 inches; Roadmaster – 62.7 inches. NOTE: When Special is equipped with 7.10 x 15 tires the height is 60.4 inches.
- Front tread: All – 59.0″.
- Rear tread: Special and Century – 59.0 inches; Super and Roadmaster – 62.2″.
- Tires: Special – 7.10 x 15; Century and Super 7.60 x 15; Skylark and Roadmaster – 8.00 x 15.
- Optional Tires: Special – 7.60 x 15.
1955 Buick Facts – Powertrains
- Dynaflow Transmission Ratios
- All: 1st – 1.82, 2nd – 1:10, Reverse – 1.82:1.
- Special Stator Stall Ratio 2.1 @ 1300 RPM (low angle) 2.5 @ – 2300 RPM.
- Century, Super & Roadmaster Stator Stall Ratio 2.1 @ 1500 RPM (low angle) 2.5 @ – 2500 RPM.
- Three Speed Manual Transmission Ratios
- Special: 1st – 2.67:1, 2nd – 1.66:1, 3rd – 1:1, Reverse – 3.02:1.
- Century & Super: 1st – 2.39:1, 2nd – 1.53:1, 3rd – 1:1, Reverse – 2.353:1.
- Rear Gear Standard Ratios
- Dynaflow Transmission: Special – 3.60:1.
- Dynaflow Transmission: Century, Super, and Roadmaster – 3.40:1.
- Manual transmission: Special, Century and Super Only – 3.90:1.
1955 Buick Facts – Power Train Options
- Engines:
- 264 CID 188 HP V-8: Standard on Special, Not Available on others.
- 322 CID 236 HP Super V-8: Super only, Not Available Others. NOTE: Super Models received a less aggressive camshaft.
- 322 CID 236 HP V-8: Standard on Century, and Roadmaster AMT, Not Available Others.
- Transmissions:
- Dynaflow Transmission: Standard on Roadmaster, Optional Special, Century and Super ($193).
- Three Speed Manual Transmission: Standard on Special, Century and Super; not available on Roadmaster.
1955 Buick Facts – Significant Options
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- Accessory group, for Special (includes electric clock, rear license frame, full wheelcovers, & trunk light.
- Air conditioning.
- Antenna, electric.
- Cushion toppers.
- Deluxe Handy mats.
- Dor-Gards.
- Easy-Eye glass.
- Electric clock.
- Gas door guard.
- Handy mats.
- Handy-Spot-lite.
- License frames.
- Outside rear view mirrors.
- Power brakes, standard Roadmaster.
- Power front seat adjustment,
- Power steering ($108, standard for Series 50 and 70).
- Power windows, standard on Roadmaster 2-door hardtop and convertible.
- Radio, Selectronic.
- Radio, Sonomatic.
- Rear seat speaker, except convertibles and station wagons.
- Rear view mirror, inside glare-proof.
- Rear view mirrors, outside glare-proof, right and left-hand.
- Red Liner speedometer with trip mileage indicator (for Special, standard other Series).
- Safety group (includes back-up lights, brake warning light, windshield washer, standard Series 70).
- Spotlite.
- Tissue dispenser.
- Tool kit.
- Two-tone and tri-tone paint.
- Visor vanity mirror.
- Wheel covers, full (standard on Roadmaster).
- Whitewall tubeless tires.
- Windshield washer.
- Wire wheels, genuine 40-spoke (not available on Special).
1955 Buick Downloads and Images
1955 Buick Facts – Related Document Downloads
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1955 Buick Large Brochure – Revised
1955 Buick Print Advertisements
1955 Buick AMA Specifications Sheets
1955 Buick Century Road Test -Motor Trend Magazine
1955 Buick Facts – Related Images
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1955 Buick Roadmaster Convertible
The 1955 Buick Roadmaster Convertible was the top line convertible Buick in 1955. 4,730 were sold.
1955 Buick Roadmaster 2-door Hardtop
The 1955 Buick Roadmaster 2-door Hardtop was the most expensive and luxurious 2-door in the line. It sold well, with 28,071 delivered.
1955 Buick Roadmaster 4-door Sedan
The 1955 Buick Roadmaster 4-door Sedan was the most popular of the Roadmaster series this year with 21,717 built.
1955 Buick Super Convertible
The 1955 Buick Super Convertible was the second-most expensive convertible in the line and also sat on the Roadmaster’s 127 inch wheelbase, however it was trimmed a bite less luxuriously than the senior car. 3,527 were produced.
1955 Buick Super 2-door Hardtop
The 1955 Buick Super 2-door Hardtop emulated the Roadmaster in looks but avoided the senior car’s expensive interior trim. It was a great seller with 85,656 fining customers.
1955 Buick Super 4-door Sedan
The 1955 Buick Super 4-door Sedan fell between the Roadmaster 4-door and that of the Century, albeit with the 127 inch wheelbase. 43,280 customers opted for this model.
1955 Buick Century Convertible
The 1955 Buick Century Convertible was the sporty and speedy drop top in 1955. 5,588 found happy customers.
1955 Buick Century 4-door Hardtop
The 1955 Buick Century 4-door Hardtop was the new on the scene from GM 4-door hardtop this year. Only available in this and the Special line, it was a sold seller with 55,088 delivered.
1955 Buick Century 2-door Hardtop
The 1955 Buick Century 2-door Hardtop was the “hot rod” of the Buick line, with the 236 HP V-8 in the smaller and lighter 122 inch wheelbase. 80,338 were sold to happy customers.
1955 Buick Century 4-door Sedan
The 1955 Buick Century 4-door Sedan provided 4-door practicality with 236 Hp “go”. 13,629 were produced – overshadowed by the new hardtop version.
1955 Buick Century California Highway Patrol 2-door Sedan
The 1955 Buick Century California Highway Patrol 2-door Sedan was created by taking a Special 2-door Sedan and mating the front end with the 236 HP 322 CID V-8 of the Century. 270 of these special-built police cars were made.
1955 Buick Century Estate Wagon
The 1955 Buick Century Estate Wagon was the highest level station wagon in the 1955 Buick line. 5,588 opted for the Century’s 236 HP V-8 over that of the Buick Special’s 188 powerplant.
1955 Buick Special Convertible
The 1955 Buick Special Convertible was the price leading convertible in the line. It sold the best of all Buick drop tops with 10,009 built.
1955 Buick Special 4-door Hardtop
The 1955 Buick Special 4-door Hardtop was the companion to the sister Century in the introduction of the 4-door hardtop at Buick. 66,409 left the showroom.
1955 Buick Special 2-door Hardtop
The 1955 Buick Special 2-door Hardtop was the lowest-priced 2-door hardtop in the line, but by far, the most popular. An astounding 155,818 were made.
1955 Buick Special 4-door Sedan
The 1955 Buick Special 4-door Sedan was the entry-level 4-door for Buick in 1955.It sold well , with 84,182 delivered.
1955 Buick Special 2-door Sedan
The 1955 Buick Special 2-door Sedan was the entry level Buick in 1955. A solid 61,679 were produced.









