THE 1975 CORVETTE
Thank you for joining us again here at Hobby Car Corvettes, located in Martinsburg PA, as we continue the exciting series, C3 Vette Rundown. In each post of the series, we will highlight the upgrades and additions, redesigns and removals for each year of the third generation of Corvettes. We started with the launch of the third generation in 1968, and today we bring you a thorough rundown of the 1975 Chevrolet Corvette. Wasting no more time, let’s get right to the developments of 1975.
SO LONG ZORA ARKUS-DUNTOV
On January 1, 1975, Chevrolet said goodbye to a major player in the world of Corvettes, Zora Arkus-Duntov. On this day, Duntov retired after having devoted 21 years and 7 months to General Motors. Often referred to as the “Father of the Corvette”, Duntov had felt personally compelled to contribute to the project when he saw the original Harley Earl Corvette prototype in New York. Zora was so inspired following this event, he wrote a personal letter to the president of GM, Ed Cole, detailing his insights about the Corvette.
Once employed by Chevrolet, he passionately worked “on the side” on the Corvette design, despite not being specifically assigned to the Corvette project. It was not until 1968, the first year of the third generation of Corvettes, that Duntov would be assigned as Corvette’s Chief Engineer.
1975 CORVETTE AESTHETICS
Nearly identical to the 1974 Corvette, the 1975 Corvette revealed very few notable aesthetic changes. The one design change worth noting, was made for safety and protection. On the front and rear bumper, a padding was added for extra protection for varying impacts.
Another notable change, was the rear bumper fascia. If you read our post for the 1974 Corvette, you will recall that the rear bumper fascia was made of two separate pieces, making for a noticeable seam down the center. We pointed out that this made the 1974 Corvette very easy to pinpoint. In 1975, the rear bumper was redesigned to be one, seamless, whole piece.
We continue to mention, that just as notable as the additions, are the removals. 1975 would be the last year of the third generation Corvettes to offer the convertible as an option. If you haven’t noticed in the option codes, production and pricing chart following this post, the numbers for convertibles ordered have been dramatically declining. This year, of the impressive 38,465 Corvettes produced and ordered, only 4,629 were convertibles. This means that the 1975 Convertible Corvettes just barely counted for 12% of the Corvettes ordered.
While the declining of the orders was the original argument for cutting the convertible, the pending legislation banning fully open model cars was the catalyst. When this talk began, Chevrolet made the decision to cut convertibles for future models. Seeing as how we have convertibles today, it almost doesn’t need to be pointed out, that the talk of this radical change never came to fruition. Convertibles would eventually return to the Corvette assembly line, but they would never be more affordable than they had been before the decade long hiatus to come.
1975 CORVETTE MECHANICS
Engine options were limited in 1974, but even moreso for 1975 Corvettes. The only Chevrolet Corvette engines that would be offered in 1975 included the stock, 165 horsepower, 350 cubic inch engine, and the optional RPO L82 205 horsepower, 350 cubic engines. This being said, there were few mechanical changes, just as there were few aesthetic changes. With no larger engine available, L82 hood emblems adorned cars so equipped.
This was the year, however, that catalytic convertors were introduced. Catalytic convertors were designed and introduced to convert toxic byproducts produced by internal combustion engines into a less toxic substance via catalysed chemical reactions. The introduction of the catalytic convertor also eliminated the option of the dual exhaust. The dual exhaust pipes were routed to a single convertor, then split again leading to dual mufflers and tailpipes.
With the removal of lead fuel, and the introduction of the catalytic convertor, the 1975 Corvette was described as
“a more efficient Corvette“
A couple more small changes included Tachometers began to be driven by electrical impulses, as opposed to mechanical and drivers would now see their kilometers per hour in subtext below the miles per hour.
DID YOU KNOW
1975 would be the last year in the third generation Corvettes to include a convertible option.
The catalytic convertor was introduced to the world of automobiles in 1975.
Another hot year for Corvette, despite few changes being made. With a total of 38,465 Corvettes being sold this year, 1975 was within 300 units of the 1969 sales numbers, which still held the title for Corvettes’ best selling year at this point.
As always, whether extravagant changes or notable removals, we continue to respect each year of the third generation of Corvettes. Every year, every model, is a necessary piece in the process.
We hope these posts have been helping you to either expand your Corvette knowledge, or determine what year is best for you to add to or begin your Corvette collection. No matter your goal in visiting us here at Hobby Car Corvettes, we are always here to offer guidance or talk shop. We love connecting with Corvette enthusiasts all over the world. If you are looking to buy, please feel free to check out the 1975 Corvettes we currently have for sale, listed below. We will see you again next week, for the rundown of the 1976 Corvette!
We currently have the following 1975 corvettes for sale:
Just Arrived This is a really sharp 75 corvette with great looks and power. It’s a lot of fun to cruise around in with great sound from Just Arrived 383 engine, automatic transmission, saddle interior, power steering, power brakes, power windows, tilt and telescopic wheel, X-A/C, AM/FM/Cassette radio, rally wheels, HEI ignition, dual exhaust, Just Arrived Numbers matching, 4 speed manual transmission, 11,900 miles on dash (title is exempt for mileage), A/C, rally wheels, black interior, crank windows, tilt and telescopic
This is a really sharp 75 corvette with great looks and power. It’s a lot of fun to cruise around in with great sound from
383 engine, automatic transmission, saddle interior, power steering, power brakes, power windows, tilt and telescopic wheel, X-A/C, AM/FM/Cassette radio, rally wheels, HEI ignition, dual exhaust,
Numbers matching, 4 speed manual transmission, 11,900 miles on dash (title is exempt for mileage), A/C, rally wheels, black interior, crank windows, tilt and telescopic
|MODEL||1975 CHEVROLET CORVETTE|
|BODY STYLE||Two-door convertible/coupe, front engine, rear wheel drive|
|MANUFACTURING LOCATION||St. Louis, Missouri|
|Original Price||$6,810.10 (Coupe), $6,550.10 (Convertible)|
|Classic White, Silver, Bright Blue, Steel Blue, Bright Green, Bright Yellow, Medium Saddlet, Orange Flame, Dark Red, Mille Miglia|
|Black, Silver, Dark Red, Saddle, Dark Blue, Neutral|
|CONSTRUCTION||Uniconstruction: fiberglass reinforced plastic (FRP or “fiberglass”) body, backboned by a steel cage outlining the passenger compartment. Principal members – underbody, front and rear end assemblies, dash panel and hinge pillars are bonded, riveted, or bolted together and to each other. Hood is plastic with bonded plastic reinforcement. Coupe: two removable roof panels and removable rear window. Frame: all welded, full length, ladder construction with 5 crossmembers. Side Rails and intermediate crossmembers box section; front crossmember box girder section. Eight body-mounting points.|
|VEHICLE NUMBERS (VIN)||1Z37J5S400001 – 1Z37J5S438465|
|ENGINE SUFFIX||CHA: 350 CUBIC INCH, 165 HORSEPOWER, MANUAL
CHB: 350 CUBIC INCH, 165 HORSEPOWER, AUTOMATIC
CHC: 350 CUBIC INCH, 205 HORSEPOWER, MANUAL
CHR: 350 CUBIC INCH, 205 HORSEPOWER, AUTOMATIC, CALIFORNIA EMISSIONS
CHU: 350 CUBIC INCH, 165 HORSEPOWER, MANUAL
CHZ: 350 CUBIC INCH, 165 HORSEPOWER, AUTOMATIC, CALIFORNIA EMISSIONS
CKC: 350 CUBIC INCH, 205 HORSEPOWER, AUTOMATIC
CRJ: 350 CUBIC INCH, 165 HORSEPOWER, MANUAL
CRK: 350 CUBIC INCH, 165 HORSEPOWER, AUTOMATIC
CRL: 350 CUBIC INCH, 205 HORSEPOWER, MANUAL
CRM: 350 CUBIC INCH, 205 HORSEPOWER, AUTOMATIC
CUA: 350 CUBIC INCH, 165 HORSEPOWER, MANUAL
CUB: 350 CUBIC INCH, 165 HORSEPOWER, MANUAL
CUD: 350 CUBIC INCH, 205 HORSEPOWER, MANUAL
CUB: 350 CUBIC INCH, 205 HORSEPOWER, MANUAL
|ENGINE BLOCK NUMBER||3970010: 350 CUBIC INCH, 180 HP, 210HP|
|HEAD NUMBER||333882: 350 CUBIC INCH, 180HP, 210HP|
|CARBURETOR NUMBERS||ROCHESTER Q-jet #17056206: 350 CUBIC INCH, 180HP, AUTOMATIC TRANSMISSION
ROCHESTER Q-jet #17056207: 350 CUBIC INCH, 180HP, MANUAL TRANSMISSION
ROCHESTER Q-jet #17056210: 350 CUBIC INCH, 210HP, AUTOMATIC TRANSMISSION
ROCHESTER Q-jet #17056211: 350 CUBIC INCH, 210HP, MANUAL TRANSMISSION
ROCHESTER Q-jet #17056226: 350 CUBIC INCH, 210HP, AUTOMATIC TRANSMISSION
ROCHESTER Q-jet #17056506: 350 CUBIC INCH, 180HP, AUTOMATIC TRANSMISSION
ROCHESTER Q-jet #17056507: 350 CUBIC INCH, 180HP, MANUAL TRANSMISSION
|DISTRIBUTOR NUMBER||1103200: 350 CUBIC INCH, 210HP, MANUAL
1112888: 350 CUBIC INCH, 180HP
1112905: 350 CUBIC INCH, 180HP, AUTOMATIC, CALIFORNIA EMISSIONS
1112979: 350 CUBIC INCH, 210HP, AUTOMATIC
|ALTERNATOR NUMBER||1102474: 350 CUBIC INCH, AIR CONDITIONING
1102484: 350 CUBIC INCH, WITHOUT AIR CONDITIONING
|AXLE IDENTIFICATION NUMBER||AA: 3.55:1 RATIO
AB: 3.70:1 RATIO
AC: 4.11:1 RATIO
AY: 2.73:1 RATIO
AW: 3.08:1 RATIO
AX: 3.36:1 RATIO
LR: 3.36:1 RATIO
|PRODUCTION ENDING VEHICLE||OCT., 1974: 402385, FEB., 1975: 417112, JUN., 1975: 433474, NOV.. 1974: 406180, MAR., 1975: 420856, JUL, 1975: 438465, DEC., 1974: 409190, APR., 1975: 425228, JAN., 1975: 413159, MAY, 1975: 429379|
Options Codes, Production, & Pricing
|1YZ37||Base Corvette Sport Coupe||33,836||$6,810.10|
|1YZ67||Base Corvette Convertible||4629||$6,550.10|
|–||Custom Interior Trim||–||$154.00|
|A85||Custom Shoulder Belts (std with coupe)||646||$41.00|
|C07||Auxiliary Hardtop (for convertible)||2,407||$267.00|
|C08||Vinyl Covered Auxiliary Hardtop||279||$350.00|
|C50||Rear Window Defogger||13,760||$46.00|
|–||Optional Rear Axle Ratio||1,969||$12.00|
|L82||350ci, 205hp Engine||2,372||$336.00|
|M21||4-Speed Manual Transmission, close-ratio||1,057||$0.00|
|M40||Turbo-Hydro-matic Automatic Transmission||28,473||$0.00|
|N37||Tilt-Telescopic Steering Column||31,830||$82.00|
|QRM||White Stripe Steel Belted Tires, GR70x15||5,233||$35.00|
|QRZ||White Letter Steel Belted Tires, GR70x15||30,407||$48.00|
|U58||AM-FM Radio, Stereo||24,701||$284.00|
|UA1||Heavy Duty Battery||16,778||$15.00|
|UF1||Map Light (on rearview mirror)||21,676||$5.00|
|YF5||California Emission Test||3,037||$20.00|
|Z07||Off Road Suspension and Brake Package||144||$400.00|
|W||Warner 4-Speed, Heavy-Duty Aluminum Case|
|CK||Turbo Hydra-Matic 400 with 350 L-48 Engine|
|CZ||Turbo Hydra-Matic 400 with 350 L-82 Engine|