The 1963 Chevrolet Impala Convertible Super Sport (SS) is one of the most celebrated full-size muscle and cruiser cars of the 1960s, defined by its distinct "flattop" body lines, hallmark four taillights, and powerful small-block and big-block V8 engine options. Finding and restoring these classic convertibles requires careful attention to factory specifications, trim codes, and verifying genuine Super Sport packages against standard Impala conversions.
Historical Context and Evolution of the 1963 Impala Super Sport
The 1963 model year marked a significant styling pivot for the Chevrolet Impala. While the basic perimeter frame and X-member architecture carried over from the 1961 and 1962 redesigns, the body panels underwent a sharp, crisper transformation. The sweeping side coves of earlier years were replaced by a clean, straight-edged beltline that ran uninterrupted from the front fender all the way to the rear fins.
For the Super Sport (SS) option, designated by production code RPO Z03, 1963 was a milestone year. Unlike previous years where the SS package could be paired with almost any full-size engine—including standard six-cylinder powerplants—the 1963 Impala SS was restricted exclusively to V8-powered models. This shift cemented the Super Sport designation as a true performance trim rather than a mere appearance package.
Production numbers for the 1963 Impala Convertible Super Sport reflect its growing exclusivity. Out of hundreds of thousands of Impalas built across various body styles (hardtops, sedans, wagons, and convertibles), only a fraction left the factory as true SS convertibles. Today, these drop-top muscle cars occupy a premier tier in the collector car market, prized for their striking proportions, hydraulic top mechanisms, and mid-century styling.
Decoding the 1963 Impala SS: Verification and Factory Specifications
Because standard Impalas can easily be upgraded with aftermarket SS badges, bucket seats, and center consoles, verifying the authenticity of a 1963 Impala Convertible SS relies heavily on decoding the vehicle identification number (VIN) and the Fisher Body cowl tag.
VIN Decoding (1963 Chevrolet Full-Size)
A typical 1963 Chevrolet full-size VIN is stamped on a plate attached to the driver-side front door pillar. For an Impala V8 model, the sequence follows a specific format:
- First Digit (Series):
3= 1963 - Second and Third Digits (Model):
18= Impala V8 (or17for standard six-cylinder, though true SS convertibles will carry V8 designations) - Fourth Digit (Assembly Plant): Letter code indicating the manufacturing facility (e.g.,
Afor Atlanta,Jfor Janesville,Sfor St. Louis) - Remaining Digits: Sequential production serial numbers.
Fisher Body Cowl Tag Analysis
The cowl tag located under the hood on the firewall provides the definitive proof of a true Super Sport package for 1963. Enthusiasts and restorers must look for the style code and accessory codes:
- Style Number: A 1963 Impala convertible body will typically read
63-1867, where63is the year,18is the Impala V8 series, and67designates the two-door convertible body style. - Body Assembly Plant and Unit Number: Follows the style number, indicating where the body shell was built.
- Trim Code: Denotes the interior color and seat material. SS models featured specific front bucket seats.
- Paint Code: Two-letter code indicating lower and upper paint colors (or numeric codes for single-stage enamels).
- Acc (Accessory) Codes: This is where the Super Sport package is explicitly verified. Look for the code
2OorZ03depending on the specific assembly plant reporting format, which designates the Super Sport equipment group.
Engine Options and Mechanical Performance
The 1963 Impala SS convertible offered buyers a broad spectrum of power, ranging from modest small-block V8s designed for relaxed cruising to high-output big-block "W-motors" built for straight-line acceleration.
Small-Block V8 Powerplants
The backbone of the 1963 lineup was the classic 283 cubic-inch and 327 cubic-inch small-block V8 engines.
- 283 cid: Typically rated at 195 horsepower with a two-barrel carburetor, offering smooth, reliable performance and excellent fuel economy for long road trips.
- 327 cid: Available in higher states of tune, including the 250-horsepower version with a four-barrel carburetor and the potent 300-horsepower variant featuring higher compression, larger valves, and a more aggressive camshaft profile.
Big-Block V8 Powerplants (The 409)
For enthusiasts seeking maximum performance, the legendary 409 cubic-inch "W-motor" transformed the heavy full-size convertible into a formidable muscle car.
- 409 cid (Single Four-Barrel): Rated at 340 horsepower.
- 409 cid (Dual Four-Barrel / 2x4): Rated at 400 horsepower, utilizing dual Carter carburetors and an aluminum intake manifold.
- 409 cid (High-Output Dual Four-Barrel): Pushed to 425 horsepower, featuring solid lifters, a high-performance camshaft, and heavy-duty valve springs.
| Engine Displacement | Carburetor Type | Factory Horsepower | Transmission Availability | Primary Application |
|---|---|---|---|---|
| 283 cid V8 | 2-Barrel | 195 hp | 3-speed manual, Powerglide | Cruising, daily driving |
| 327 cid V8 | 4-Barrel | 250 hp - 300 hp | 4-speed manual, Powerglide | Balanced performance |
| 409 cid V8 | Single 4-Barrel | 340 hp | 4-speed manual, Borg-Warner | Straight-line performance |
| 409 cid V8 | Dual 4-Barrel | 400 hp - 425 hp | 4-speed manual, Heavy-Duty | High-performance / Racing |
Transmission and Drivetrain Specifications
Putting power to the pavement in a 1963 Impala Convertible SS involved a choice of three primary transmission types, depending on the engine selection and original buyer preference:
- 3-Speed Manual (Synchromesh): Standard equipment on base V8s, utilizing a column-shifted manual linkage.
- Powerglide Automatic: A two-speed torque-converter automatic transmission known for durability and smooth operation, though it lacked the gearing flexibility of modern automatics.
- 4-Speed Manual (Borg-Warner T-10): The enthusiast's choice, paired with a floor shifter housed inside the signature SS center console.
The rear axle utilized a robust Chevrolet 10-bolt or heavy-duty unit, with gear ratios ranging from standard highway cruising ratios (like 3.08:1 or 3.36:1) up to performance ratios (such as 3.73:1 or 4.11:1) specified for 409-powered cars.
Interior Design and Super Sport Specific Features
The interior sets the 1963 Impala Super Sport apart from its standard Impala siblings. While standard models often featured bench seats and column shifters, the SS interior was driver-focused and luxurious.
Distinct Interior Elements
- Bucket Seats: Specially styled front bucket seats with patterned vinyl trim and chrome side moldings.
- Full-Length Center Console: Running from the dash between the bucket seats, the console housed either the manual 4-speed floor shifter or a chrome automatic selector plate, complete with a locking storage compartment.
- SS Grab Bar: Mounted directly onto the passenger side of the aluminum-trimmed dashboard, replacing the standard Impala glovebox door emblem.
- Instrument Cluster: Deep-set circular gauges housing the speedometer, fuel level, and warning lights, with optional auxiliary tachometers frequently mounted to the steering column or console by period owners.
Restoration and Maintenance Considerations
Restoring or maintaining a 1963 Impala Convertible SS presents unique challenges compared to hardtop models. Because convertibles lack a permanent steel roof structure, the body relies entirely on the heavy X-member frame for structural rigidity.
Common Rust Areas to Inspect
When evaluating or restoring a 1963 convertible, professional inspectors focus on specific structural vulnerability points:
- Frame Rails: The center X-section of the frame is prone to rust-through from trapped moisture and road salt.
- Rockers and Body Mounts: Convertible outer and inner rocker panels must be reinforced; sagging doors indicate compromised structural integrity at the body mount locations.
- Floor Pans and Trunk Wells: Water leaks from aging convertible top seals frequently pool in the rear footwells and trunk floorboards.
- Quarter Panels: The long, flat quarter panels on 1963 models are complex to align and prone to filler cracking if historical body repairs were substandard.
Convertible Top Mechanics
The hydraulic top mechanism relies on an electric hydraulic pump, fluid lines, and two hydraulic cylinders mounted behind the rear side panels. Ensuring proper fluid levels, replacing brittle rubber lines, and aligning the header latches correctly are essential steps to prevent binding or tearing the fabric top during operation.
Market Valuation and Collector Guidance
Values for the 1963 Impala Convertible SS have appreciated steadily, driven by strong demand for iconic 1960s drop-tops. Pricing varies dramatically based on several core factors:
- Purity and Originality: Matching-numbers engines (especially verified 409 units) command substantial premiums over non-original engine swaps.
- Documentation: Factory build sheets (protect-o-plates), dealer invoices, and historical registration chains heavily influence high-end auction pricing.
- Restoration Quality: Frame-off restorations with correct factory finishes, proper date-coded components, and flawless chrome trim routinely outperform amateur builds.
Buyers should thoroughly inspect cowl tags against official reference registries and verify mechanical stamp numbers against casting catalogs before finalizing transactions.
Frequently Asked Questions
How can I verify a real 1963 Impala SS convertible?
True factory Super Sport models for 1963 can be verified by checking the Fisher Body cowl tag for the Z03 or 2O accessory code. Additionally, VIN decoding must indicate a V8 model (18 in the second and third positions), and factory SS models will feature dedicated structural reinforcement plates for the convertible frame and unique bucket-seat floor brackets.
What engines were available in the 1963 Impala SS?
The 1963 Impala SS was available exclusively with V8 engines. Options ranged from the base 283 cubic-inch small block up through various 327 small-block configurations, culminating in the legendary 409 cubic-inch big-block W-motor producing up to 425 horsepower.
Did all 1963 Impala SS models come with a 4-speed manual transmission?
No. While the 4-speed manual transmission paired with a center console is often associated with the SS package, buyers could also select the two-speed Powerglide automatic transmission or a 3-speed manual transmission.
What are the most common rust spots on a 1963 Impala convertible?
The most critical rust areas include the center X-member of the frame, the inner and outer rocker panels, the rear floor pans, and the trunk drop-offs. Because convertibles flex more than hardtops, structural rust in these areas compromises both safety and body alignment.
Are replacement parts easy to find for a 1963 Impala convertible?
Yes. Due to the massive popularity of full-size Chevrolets from this era, mechanical components, brake parts, suspension kits, and interior soft goods are widely reproduced by specialized classic Chevrolet parts suppliers. However, specific convertible-only trim, weatherstripping, and stainless steel moldings can be expensive and difficult to source in pristine condition.
Conclusion
The 1963 Chevrolet Impala Convertible Super Sport remains a pinnacle of American automotive design, blending open-air cruising comfort with formidable V8 performance. Whether evaluating a high-point concours restoration or planning a mechanical refresh, understanding the unique cowl tags, drivetrain specifications, and structural requirements of these rare convertibles ensures informed ownership and the preservation of an automotive icon.
