1968 Chevrolet Ss – Authenticity and Performance Guide

The 1968 Chevrolet SS stands as a true muscle car icon, particularly the Chevelle SS 396. Identifying a genuine model requires checking specific VIN codes and unique features that set it apart from clones. Understanding its original engine specifications, design elements, and transmission options is crucial for enthusiasts and potential buyers alike.

Ah, the roar of a big block, the unmistakable lines of classic American muscle – few vehicles evoke such passion as the 1968 Chevrolet SS. If you’re a classic car enthusiast, a weekend wrench-turner, or even just someone dreaming of owning a piece of automotive history, the ’68 SS Chevelle represents a golden era.

But with its popularity comes a challenge: distinguishing a true, factory-built Super Sport from the many excellent tributes and clones out there. It’s not just about aesthetics; it’s about authenticity, performance, and preserving history.

This comprehensive guide will dive deep into what makes the 1968 Chevrolet SS so special. We’ll explore its iconic features, decode critical identification markers, and equip you with the knowledge to appreciate, maintain, and even confidently assess these magnificent machines. Let’s get started on your journey to mastering the ’68 SS.

The Legendary 1968 Chevrolet SS Chevelle: An Overview

The 1968 model year was a pivotal one for Chevrolet’s mid-size line, bringing a complete redesign that solidified the Chevelle’s status as a muscle car powerhouse. The Super Sport (SS) package, particularly on the Chevelle, was the flagship of this performance revolution.

It wasn’t just a trim level; it was a statement. The SS promised big-block power, aggressive styling, and a driving experience that was second to none for its era. For many, the ’68 Chevelle SS 396 is the quintessential muscle car.

Redesign for a New Era

The ’68 Chevelle debuted with a striking new “Coke bottle” styling, a significant departure from the more upright lines of previous years. This sleeker, more sculpted body featured a shorter wheelbase for improved agility and a wider stance.

The front end boasted a distinctive blacked-out grille, often hiding the optional hideaway wipers, giving it a clean, aggressive look. Twin headlamps were recessed, and the overall impression was one of raw power barely contained.

This fresh design wasn’t just cosmetic; it set the stage for the powerful engines lurking beneath the hood, promising performance that matched its aggressive appearance.

The Heart of the Beast: The 396 Cubic-Inch V8

At the core of the 1968 Chevelle SS was the legendary 396 cubic-inch V8 engine. This big-block powerhouse was available in several configurations, each delivering impressive horsepower and torque.

The base SS 396 came with the L35 396 Turbo-Jet V8 engine, rated at 325 horsepower. A step up was the 350-horsepower version, and for those craving maximum performance, the rare L78 variant delivered a potent 375 horsepower.

These engines were renowned for their robust construction and incredible low-end torque, making the Chevelle SS a formidable competitor on the street and drag strip. The sound alone was enough to turn heads, a deep rumble promising brute force.

Decoding the 1968 Chevrolet SS VIN and Authenticity

When you’re looking at a classic muscle car, especially a highly sought-after model like the 1968 Chevrolet SS, authenticity is paramount. Many excellent tribute cars exist, but a genuine factory SS carries a special cachet and value.

Knowing how to identify a real SS is crucial for any potential buyer or enthusiast. It prevents costly mistakes and ensures you’re getting what you pay for.

The ‘138’ VIN Prefix Explained

For 1968 Chevelle SS models, the single most important identifier for authenticity is the Vehicle Identification Number (VIN). Specifically, you need to look at the first three digits of the VIN.

• 138: This prefix (138xx) indicates a genuine Chevelle SS 396 for the 1968 model year.
• 136: This prefix (136xx) would denote a Malibu, which could have been optioned with a 396 engine but was not a true SS from the factory.

Always verify the VIN on the car’s title, door jamb, and dash tag. A mismatch or an incorrect VIN prefix is a major red flag that warrants further investigation, or simply walking away.

Common Clone Warning Signs

While the VIN is the primary indicator, other details can help you spot a clone or tribute car. Many of these are well-built, but they aren’t original SS models.

1. Lack of VIN Match: As mentioned, if the VIN doesn’t start with ‘138’, it’s not a factory SS.
2. Missing SS Specific Trim: Check for proper SS badging on the grille, fenders, and rear panel. These should be correct for the 1968 model year.
3. Incorrect Engine Components: While a 396 might be present, verify engine casting numbers and date codes. A genuine SS would likely have its original or period-correct L35, L34, or L78 396 cubic-inch V8 engine, often paired with a Rochester Quadrajet 4-barrel carburetor.
4. Interior Discrepancies: Look for SS-specific interior items like optional bucket seats, a center console, and SS steering wheel badging. Clones might have incorrect upholstery patterns or missing features.
5. Suspension and Drivetrain: A true SS Chevelle would typically feature a 12-bolt Posi-traction rear differential and the F41 heavy-duty suspension package. Inspect the rear axle and suspension components.

Always bring a knowledgeable friend or expert when inspecting a classic. A pre-purchase inspection by a specialist is always a wise investment.

Performance and Powertrain: Mastering the Drive

The 1968 Chevrolet SS was built for performance, and understanding its powertrain and chassis components is key to appreciating its capabilities and for proper maintenance.

From the robust engine to the stout drivetrain, every component played a role in delivering that exhilarating muscle car experience. Knowing these details helps you diagnose issues and plan for upgrades or restoration.

Engine Specifications: More Than Just Horsepower

The 396 cubic-inch V8 offered varying power outputs, but each shared a common heritage of big-block reliability. Beyond the horsepower figures (325hp, 350hp, and the potent 375hp L78), other details matter.

• Carburetion: Most 396 engines used a Rochester Quadrajet 4-barrel carburetor, known for its strong performance and fuel delivery.
• Ignition: The Delco-Remy point-type ignition system was standard. For DIYers, understanding vacuum advance distributor timing and hydraulic valve lifter adjustment is crucial for optimal running.
• Cooling: A robust cooling system was essential. Check the radiator, hoses, and water pump during inspections.

Maintaining these classic engines requires a careful touch. Regular oil changes, spark plug checks, and ignition timing adjustments are vital. If you’re tackling these yourself, always consult a service manual specific to your year and engine. For complex tasks like rebuilding a Chevrolet Small Block Engine (or big block in this case), specialized tools and expertise are a must.

Transmission Choices: Manual vs. Automatic

The 1968 SS offered drivers a choice of transmissions to match their driving style.

• Manual Transmissions: The Muncie 4-speed manual transmission was a popular choice, particularly the Muncie M21 close-ratio 4-speed manual transmission for spirited driving. These are highly desirable today.
• Automatic Transmission: The Turbo-Hydramatic 400 (TH400) was the heavy-duty automatic option, known for its strength and smooth shifts, capable of handling the 396’s torque.

Each transmission has its own maintenance schedule. Manual transmissions require regular fluid checks and clutch adjustments, while automatics benefit from fluid and filter changes. Listen for unusual noises or rough shifting, which could indicate internal wear.

Suspension and Braking for the Street

While known for straight-line speed, the SS also needed to handle and stop. The F41 heavy-duty suspension package was standard on the SS, offering stiffer springs, firmer shocks, and a rear sway bar for improved handling.

Braking was typically handled by power drums, though power disc brakes were an available option, especially at the front. The Moraine power disc brake master cylinder provided improved stopping power over the standard drums.

When working on the brakes, always prioritize safety. Ensure your brake lines are bled properly after any component replacement. Inspect the Saginaw power steering pump for leaks or unusual noises, as a failing pump can affect steering feel and control.

Exterior and Interior Distinctions of the SS

Beyond the mechanicals, the visual appeal of the 1968 Chevrolet SS is undeniable. Its unique styling cues and interior appointments set it apart from lesser Chevelle models, contributing to its legendary status.

Understanding these details helps in both appreciation and restoration, ensuring that any work done respects the car’s original design and intent.

Iconic Styling Cues

The ‘Coke bottle’ styling was just the beginning. The 1968 SS incorporated several distinctive features:

• Power-Dome Hood: A prominent, raised section on the hood, hinting at the powerful engine underneath. This was a signature SS element.
• Blacked-Out Grille: The specific pattern and black finish of the grille were unique to the SS.
• SS Badging: Strategically placed SS emblems on the grille, front fenders, and rear panel. These were often chrome on a black background.
• Hideaway Wipers: An optional, but highly desirable, feature where the windshield wipers would disappear beneath the rear edge of the hood when not in use, creating a cleaner look.
• Chrome Trim: Specific chrome trim around windows, wheel wells, and rocker panels complemented the body lines.

When restoring, sourcing correct Chevrolet restoration parts for these exterior elements is crucial for maintaining authenticity and value.

Interior Appointments and Comfort

Inside, the SS continued its performance-oriented theme while offering a comfortable cabin. Buyers could choose from various options to personalize their muscle car.

• Bucket Seats and Console: Often equipped with optional bucket seats and a floor-mounted center console, which housed the shifter for either the manual or automatic transmission.
• SS Badging: The SS emblem would typically appear on the steering wheel horn button and sometimes on the dashboard.
• Instrumentation: A full array of gauges, often including a tachometer, provided the driver with critical engine information.
• Upholstery: Specific vinyl patterns and color options were available, often in black, red, or parchment, complementing the exterior paint choices.

The interior of a well-preserved 1968 Chevrolet SS truly transports you back in time, showcasing the blend of raw power and surprising comfort that defined American muscle cars.

Original Color Palette Insights

The 1968 Chevelle SS was available in a vibrant array of colors that reflected the era’s bold aesthetic. Popular choices included:

• Tripoli Turquoise: A striking, deep blue-green.
• Cordovan Maroon: A rich, deep red.
• Rallye Green: A bright, eye-catching green.
• Matador Red: A classic, vibrant red.
• Tuxedo Black: The timeless, powerful black.

Understanding the original color options is important for restoration. A car painted in a non-original color, or one not offered for the SS, might detract from its value or indicate a less authentic restoration. Always check the trim tag on the cowl to verify the original color code.

Owning a 1968 Chevrolet SS Today: Maintenance and Market

Owning a classic like the 1968 Chevrolet SS is a dream for many, but it comes with responsibilities. Proper maintenance is key to preserving its legacy and ensuring it remains a joy to drive. Furthermore, understanding its place in the current collector market is crucial for owners and prospective buyers.

Essential Maintenance for Classic Performance

Unlike modern vehicles, a classic SS requires a more hands-on approach to maintenance. Regular checks and preventative care are paramount.

1. Fluid Checks: Regularly inspect engine oil, transmission fluid, brake fluid, and coolant levels. Old seals can leak, and proper fluid levels are vital for longevity.
2. Ignition System: With a Delco-Remy point-type ignition system, periodic inspection and adjustment of points and condenser, along with spark plug replacement, are essential for smooth running.
3. Carburetor Tuning: The Rochester Quadrajet 4-barrel carburetor may require occasional tuning or cleaning, especially if the car sits for extended periods.
4. Brake System: Even with a Moraine power disc brake master cylinder, inspect brake pads, shoes, and lines frequently. Bleed the brake lines every few years to ensure fresh fluid.
5. Suspension Components: Check bushings, ball joints, and tie rods for wear. The F41 heavy-duty suspension package components can wear over time, affecting handling.
6. Tires: Ensure tires are in good condition and correctly inflated. Classic car tires often degrade more from age than mileage.

Always use period-correct or high-quality modern equivalents for replacement parts. If you’re unsure about a repair, don’t hesitate to seek advice from a specialist mechanic familiar with vintage Chevrolet Exhaust Manifold systems and classic drivetrains.

Market Value and Collector Trends

The 1968 Chevelle SS 396 remains a highly desirable collector car. Its value can vary significantly based on:

• Authenticity: Genuine 138-code SS models command the highest prices.
• Condition: Original, unrestored cars in excellent condition (survivors) or meticulously restored examples fetch top dollar.
• Engine Option: The rare L78 375hp 396 is particularly sought after.
• Transmission: Manual transmissions, especially the Muncie M21 close-ratio 4-speed manual transmission, often add to the value.
• Documentation: Original build sheets, dealer invoices, and ownership history can significantly boost a car’s provenance and value.

Auction trends show a strong, steady market for well-documented, authentic 1968 SS Chevelles. While values fluctuate, these cars tend to hold their worth well, making them not just a passion project but also a sound investment for enthusiasts.

Authenticity Checklist for the 1968 Chevrolet SS

To help you in your quest for a genuine 1968 Chevrolet SS, here’s a quick checklist to guide your inspection. This isn’t exhaustive but covers the most critical points.

This checklist provides a strong foundation. For absolute certainty, professional documentation research and an expert appraisal are recommended.

Frequently Asked Questions About the 1968 Chevrolet SS

How can I tell if my 1968 Chevelle SS is real?

The most definitive way to identify a real 1968 Chevelle SS is to check the first three digits of its Vehicle Identification Number (VIN). A genuine SS 396 will have a VIN that starts with “138”. Any other prefix, such as “136” for a Malibu, indicates it’s not a factory-built SS.

What were the engine options for the 1968 Chevelle SS?

The 1968 Chevelle SS was exclusively powered by the 396 cubic-inch V8 engine, known as the Turbo-Jet. It was available in three different horsepower ratings: the base 325 hp (L35), a mid-tier 350 hp (L34), and the high-performance 375 hp (L78) variant. All used a Rochester Quadrajet 4-barrel carburetor.

What does ‘L78’ mean for a 1968 SS 396?

The ‘L78’ designation refers to the highest-performance version of the 396 cubic-inch V8 engine offered in the 1968 Chevelle SS. This variant produced 375 horsepower thanks to solid lifters, a more aggressive camshaft, and higher compression, making it a highly sought-after option for collectors.

Are other 1968 Chevrolet SS models as desirable as the Chevelle?

While the Chevelle SS is arguably the most iconic, Chevrolet also offered SS versions of the Camaro, Nova, and Impala in 1968. Each has its own dedicated following and market value. The 1968 Camaro SS is also highly desirable, especially with big-block options, as are certain Nova SS configurations. The Impala SS, while a full-size car, offered big-block power and a comfortable ride.

Final Thoughts on the Enduring Appeal

The 1968 Chevrolet SS, particularly the Chevelle SS 396, remains a benchmark in American automotive history. It perfectly encapsulates the muscle car era: aggressive styling, potent big-block power, and a raw, engaging driving experience.

Whether you’re meticulously restoring one, confidently verifying its authenticity, or simply admiring its lines at a car show, understanding the nuances of this classic enhances the experience. These machines are more than just metal and rubber; they are a testament to an era of unbridled automotive passion.

Embrace the journey of learning and discovery. Drive safe, maintain with care, and savor every moment with these incredible pieces of engineering. Your passion fuels the legacy of the 1968 Chevrolet SS.