The Super Sport Impala full sized power

Chevrolet’s full-size Super Sport went from a genuine performance flagship in 1966 to a nearly unmarked sleeper by 1969, as buyers defected to the Chevelle and Nova and the SS427 option shrank to just a few thousand units a year. Front disc brakes finally arrived in the model’s final season. Read on to find out how to tell a genuine SS427 from a well-built tribute.

By the time Chevrolet built its last full-size Super Sport in 1969, the car had become almost invisible on purpose — the only outward giveaway a small emblem on the steering wheel, with none of the badges, stripes, or hood scoops that had announced every SS Impala before it. That quiet final year sat at the end of a slow retreat that had started years earlier, as buyers who once wanted a big, powerful Impala increasingly wanted a smaller, lighter Chevelle or Nova instead. Understanding how the full-size Super Sport went from showroom star to a sleeper nobody could spot in a parking lot means tracing exactly what Chevy changed — and what it quietly took away — across four model years.

1966: The Year Buyers Started Looking Elsewhere

The 1966 SS Impala offered genuinely upgraded seating — new thin-shelled, high-backed bucket seats with a center console, or a strato bench seat with a fold-down armrest, with a proper gauge package available as an option. None of that stopped a dramatic shift already underway: full-size SS sales fell by roughly 50 percent that year, as buyers increasingly chose vehicles from the mid-size market instead. The two most popular performance cars of 1966 turned out to be the SS396 Chevelle and the Nova SS — both, notably, from the same Chevrolet division competing directly against its own full-size Super Sport.

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1967: Less Chrome, More Menace

For 1967, Chevrolet actually pulled trim away from the SS rather than adding it, giving the car a blacked-out grille and matching treatment on the side and rear fender trim while lesser Impala models kept their chromed garnishes. The base wheel covers stayed shared across the whole lineup, but SS versions carried the model’s logo enclosed in a red-white-and-blue circle on the hub caps, and every version of the badging that year simply read “Impala SS.” It was a subtler, more understated take on performance styling than the car had worn in previous years.

How Rare the Real SS427 Actually Is

Only 400 of the 1967 Impala SS models left the factory with a six-cylinder engine; the rest carried V8 power, but the truly desirable version was the RPO Z24 option, also known as SS427, which Chevrolet installed in just 2,124 units that year. That option remained available all the way through the SS Impala’s final year in 1969 and came bundled with RPO F41 heavy-duty suspension along with other performance hardware as standard equipment. Under the hood sat a 427-cubic-inch V8 rated at up to 385 horsepower, with large SS427 logos and a nonfunctional chromed hood intake replacing the standard Impala SS badging to signal exactly what was underneath.

An Even Hotter Option Most Buyers Skipped

From 1967 through 1969, SS427 buyers could optionally step up to the L72 engine, delivering 425 horsepower — a genuinely serious number for a full-size car in this era. Most performance-minded buyers, though, were already gravitating toward mid-size models instead, which meant the SS427 Impala, despite being extremely quick in a straight line, sold in very small numbers and remains correspondingly rare today. Chevrolet essentially had two performance cars competing for the same shrinking pool of buyers, and the full-size version was losing that internal fight year after year as American tastes kept shifting toward smaller, lighter platforms.

1968: A Demotion, Not a Cancellation

By 1968, Chevrolet’s Caprice was steadily gaining sales at the same pace the full-size performance market was declining, as Chevy’s own performance-minded customers migrated toward the Nova and Chevelle while rival manufacturers’ mid-size offerings pulled in still more buyers. The Super Sport package itself was demoted to RPO Z03, a $179 option available only on a convertible or one of two coupe body styles, though both the Z03 SS and the SS427 remained on the order sheet. The distinctive high-backed bucket seats with center console, however, were no longer offered on the SS that year — one more piece of the original package quietly disappearing.

Details That Still Separate Real Cars From Tributes

1968 SS badging read simply “Impala SS” but still incorporated SS427 emblems where applicable, and the genuine article carried a distinctively layered hood along with three gills on each front fender just behind the wheel wells. Given how rare and valuable authentic SS427 Impalas have become, plenty of tribute cars have been built over the years to replicate the look, but several of the finer factory details are difficult or impossible to duplicate convincingly — which means verifying an original requires real attention to the smaller specification points rather than just the obvious badges.

1969: The Sleeper Year

The final year for the Impala SS earned its reputation as a genuine sleeper, identifiable from the outside by essentially nothing beyond a small SS emblem set into the center of the steering wheel. Every 1969 Impala SS came with the 427-cubic-inch V8, since it was the only engine offered that year, available in three power outputs — 335, 390, or 425 horsepower. It was also the first and only year Chevrolet offered front disc brakes as a factory option on the SS Impala, and genuine factory-equipped cars carry 15-inch discs, larger than the 14-inch discs or drums found on the rest of the 1969 Impala lineup.

A Naming Quirk That Still Confuses Buyers Today

The RPO Z24 designation itself has become something of a secret handshake among Chevrolet collectors, since so many casual buyers over the decades never realized the SS427 code even existed as a separate factory option from the standard SS package. That naming quirk, more than anything else, is why so many surviving 1967 through 1969 Impalas get misidentified in online listings and at small regional car shows, sometimes selling for well under what a properly documented example should command.

The Platform’s Place in Automotive History

These final full-size Super Sports represent the last, rarest, and most valuable examples of the model Chevrolet ever built, and the details outlined here are exactly what separates a genuine factory car from a well-built clone. It’s also worth remembering the scale involved: Chevrolet’s “B” platform, used from 1965 through 1970, ranks as the fourth bestselling automotive platform in history, trailing only the Volkswagen Beetle, the Ford Model T, and the European-market Lada Riva — context that makes the SS Impala’s declining sales during this exact window feel even more counterintuitive, since the platform underneath it was, by any measure, one of the most successful Chevrolet ever built.

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