Looking back on full sized domestic cars from the 1960s, you might think that the popular SS designation actually stood for Super Sized. In truth, this 1969 Impala rests on a wheelbase only three inches longer than the same year’s four-door Chevelle, but the Impala’s freshened styling for that year emphasized a substantial look.

The era of muscle cars was in full swing and while pony cars and intermediates were taking to the streets in droves, Chevrolet’s full sized lineup was not being ignored in the performance department. Although a 250cui inline six was available in a few models, the 327 V8 was standard for most.

Chevrolet did offer a range of optional V8’s for the big cars, starting with the 350cui in either 255hp (LM1) or 300hp (L48) versions. Beyond this lay the 265hp L66 396cui V8 and then the 427 was offered in 335 hp (LS1) or 390 hp (L36) configurations.

Not listed in any dealer sales or ordering materials was an option known as Z24. This so-called ‘secret’ 427 pumped out 425 hp and could be ordered in any full sized Chevy. According to estimates, only 546 full size cars were built with this engine. That is what lies under the hood of this 1969 Chevrolet Impala SS being auctioned currently on eBay.

According to the seller, it is one of fewer that 100 L72 Impalas built that year. Apparently, GM didn’t keep good records for options that weren’t published. Since the L72 didn’t require the SS option, this example could be a one of a significantly smaller number, but we’ll never know for a fact. Even without the L72 engine, there were only 2,455 Impala SS cars built this year.

Certainly, the original buyer of this Impala SS knew exactly what he was after and the optional equipment list speaks directly to this. After the Z24 Supersport 427 option was identified, the M40 3-Speed automatic came next (an M22 4-speed was available, but discouraged with the big engine), with F41 Special Performance suspension, J52 power disc brakes, N40 power steering and G80 Positraction rear axle.

Currently located in St. Louis, MO, this numbers-matching 1969 Impala SS is on the block until mid-day on June 11. Bidding action has been non-existent with the car’s listed price of $36,900. Certainly, the photos appear to indicate a car that is in top notch shape and quality does not come cheaply.

Seller contact information is provided in the eBay listing, so inquiries will be easy to make and are invited by the seller. We’d bet that a speciulative trip to St. Louis would see you driving home, rather than flying, but if you can’t check out the car personally, consider having an independent inspection and report done before making any financial arrangements.