1970 Chevelle SS Verification Guide

1970 Chevelle SS Verification Guide

Last Updated October 17, 2024

The 1970 Chevelle Super Sport (SS) is a timeless icon in the world of American muscle cars. Known for its aggressive looks and impressive performance, it remains a favorite among collectors and enthusiasts alike. The range of engine options makes the 1970 model year particularly exciting. Chevrolet offered various power levels that transformed the Chevelle into a high-performance machine. By learning about these engine choices and key features, you’ll be ready to find a 1970 Chevelle Super Sport yourself.

1970 Chevelle SS Engine Options: Power and Performance

The 1970 Chevelle SS offered a lineup of engines that catered to those looking for serious power. The engine options fell into two main categories that provided different levels of performance.

The first category, known as the Z25 option, featured the 396 cubic inch V8 engine. This engine came in two variations: the L34, which generated 350 horsepower, and the L78, which produced 375 horsepower. Both engines packed enough punch to give the Chevelle serious muscle on the road, but the L78 was especially desirable for those wanting more horsepower under the hood.

A close up of a 396 engine in the engine bay of a 1970 Chevelle SS

Later in the year, the Z15 option introduced the LS5 and LS6 engines, replacing the L78. The LS5 offered 360 horsepower, but the real star was the LS6, which delivered a whopping 450 horsepower—the most powerful engine Chevrolet offered in 1970. The LS6 featured a solid-lifter camshaft, providing higher rev limits and more precise performance than the hydraulic-lifter LS5. This mechanical difference set the LS6 apart as one of the most formidable engines in muscle car history.

The LS6 engine required a unique fuel line setup to handle its increased fuel demands. Early LS6-equipped Chevelles came with a single fuel line, while later models switched to a dual fuel line configuration. This small yet crucial distinction helps identify LS6 Chevelles and adds to their rarity and desirability among collectors.

A close up of a 396 engine in the engine bay of a 1970 Chevelle SS

Identifying a True 1970 Chevelle SS

The authenticity of a 1970 Chevelle SS goes beyond the engine options. Various other details and features can help confirm whether a car is a genuine SS model. One of the most important aspects is the cowl tag, which provides valuable information about the car's original specifications.

For example, a cowl tag from a February 1970-built Chevelle might indicate the car was originally painted Cranberry Red and came equipped with black bucket seats. This was a hallmark of many SS models. The cowl tag also provides build date information, which is essential for verifying the car's original production timeline.

Another critical feature is the rear suspension setup. The Chevelle SS models were designed to handle the extra torque and horsepower from their big-block engines. This meant the cars came equipped with boxed lower control arms in the rear, which were reinforced to prevent the suspension from collapsing under heavy loads. The presence of these boxed control arms are a key factor in identifying whether a Chevelle was built for high-performance driving.

The 12-bolt rear end is another telltale sign of a Chevelle SS. This heavy-duty rear axle was standard on SS models, providing the strength needed to handle the car’s powerful engine. However, many Chevelles have had parts swapped over the years, so it’s essential to inspect whether the rear end is original to the car or has been replaced with a later model.

The 1970 Chevelle SS Cowl Induction Hood: A Defining Feature

One of the most recognizable features of the 1970 Chevelle SS is the cowl induction hood. This raised hood not only added an aggressive look but also served a functional purpose. It channeled cooler air into the engine bay for better performance. Depending on when the car was built, the design of the cowl hood could vary.

A close up of the front end of a 1970 Chevy Chevelle with focus on the hood

Early 1970 Chevelles came with a smooth cowl induction hood, while later versions featured a crumple zone. This crumple zone looked like a small, dash-like line across the intake area that was added for safety. This change occurred mid-year, so identifying the correct hood for the build date is essential for restoring or verifying the originality of a Chevelle SS.

Fuel Line Configuration: The LS6 Clue

The fuel line setup is one of the most critical indicators when determining whether a Chevelle SS was originally equipped with the LS6 engine. Early LS6 models, built around February 1970, were outfitted with a single fuel line. This feature distinguishes them from later models, which had a dual fuel line system.

The presence of a single fuel line suggests that the car was likely built with an LS6 engine, as this configuration was specific to early high-performance models. While the engine itself might no longer be present in some cars, this small detail offers a crucial clue about the car’s original setup and performance capabilities.

A Junkyard Find with a Storied Past

It's not uncommon for classic cars to emerge from junkyards missing key components like the engine and transmission. However, even in rough condition, many Chevelles still retain the vital clues needed to piece together their original identity. From the boxed control arms to the single fuel line, the car itself often tells the story of what it once was.

For enthusiasts and restorers, finding a Chevelle in this state can be both a challenge and an exciting opportunity. Each piece of the puzzle, whether it’s the cowl tag, suspension setup, or rear axle, reveals more about the car's history. Looking for all of these pieces helps to confirm whether it was a true big-block Super Sport or another model. The thrill of discovering a potential LS6 Chevelle, even without its original engine, is enough to ignite the passion of any classic car lover.

Thanks to our friends over at Backyard Barn Finds for providing us with the basis of the information in this article!

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