Chevrolet Built Just 602 Z/28 Camaros in 1967 to Dodge Its Own Racing Rule

Chevrolet needed 1,000 Z/28 Camaros to legally race it in 1967 and built only 602. See how a paperwork loophole — and a disputed DZ-302 clone at a 2026 Carlisle auction — kept the legend alive.

Chevrolet needed 1,000 cars to legally race the Z/28 in the SCCA’s Trans-Am series in 1967. It built 602. On paper, that should have ended the story before it started — no homologation, no racing, no legend. Instead, GM leaned on a technicality involving the regular Camaro SS to get the Z/28 onto the track anyway, and the car went on to beat Mustangs and Firebirds for three straight seasons. Decades later, one of those same 302-cubic-inch small-blocks — or something built to look like one — showed up parked next to a split-window Corvette and a 429 Mustang at a Pennsylvania swap meet, and the price it pulled got people arguing in the comments about whether it was even real.

What the Fall Carlisle Walk-Through Actually Shows

Carlisle itself is part of the reason this footage carries weight with serious collectors. The Carlisle Events fairgrounds in south-central Pennsylvania have hosted swap meets, car shows, and auctions since the 1970s, and the Fall Carlisle weekend has grown into one of the largest all-marque collector gatherings on the East Coast calendar — acres of parts vendors and parked project cars surrounding the auction tent itself. It’s a working buyer’s market as much as a spectacle, which is exactly why the prices that come out of it tend to track closer to what a car is actually worth to the people who restore and drive them, rather than what a televised auction crowd will pay for the theater of a bidding war.

The video behind this story is a straightforward walk-through of the 2026 Fall Carlisle collector car auction in Carlisle, Pennsylvania, shot by the Ultimate Muscle Car channel. There’s no stage, no spotlights — just rows of consignment cars and the prices they brought, cataloged one after another the way these auction recap videos usually work. The lineup is a genuine cross-section of what actually trades hands at a mid-size regional auction rather than a televised Mecum or Barrett-Jackson spectacle: a Mustang Mach 1, a Mustang convertible, a Barracuda Formula S, a Galaxie 500XL, a Cutlass Supreme convertible, a Road Runner convertible, a split-window Corvette, a Mustang Boss 351, a Chevelle, a Comet S22 convertible, a Shelby GT350, a Chrysler 300 — and a Camaro RS Z/28 carrying the DZ engine code that collectors immediately recognize.

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That DZ badge is the detail that separates this particular Camaro from an ordinary Z/28 clone. It’s shorthand for Chevrolet’s original “divided Z/28” small-block, the 302-cubic-inch engine built for exactly one purpose: making the Camaro legal to race.

The Engine Chevrolet Built to Beat Its Own Rulebook

In 1967, the SCCA’s Trans-Am series capped engine size at 305 cubic inches for the over-2-liter class. Chevrolet didn’t have anything that fit. The smallest V8 in the new Camaro’s lineup was a 327, five cubic inches too big to race. So Chevrolet’s engineers took the 283’s shorter, 3-inch-stroke crankshaft and dropped it into the 327’s 4-inch-bore block, landing on 302.4 cubic inches — just barely legal, and an engine combination Chevrolet had never built for a production car before or since.

Officially, the DZ 302 was rated at 290 horsepower, a number nearly everyone who’s dynoed one calls conservative; period reports had it clearing 350 on the rollers, and the race-prepped versions campaigned by Roger Penske’s team reportedly made closer to 450. It needed to rev hard to make that power, which is exactly what a 3,100-pound Trans-Am Camaro racing against Mustangs and Firebirds needed it to do.

There was still the production problem. Chevrolet built only 602 Z/28s in that first 1967 model year — nowhere near the SCCA’s 1,000-unit homologation minimum. Rather than scrap the program, Chevrolet got the Z/28 classified as a variant of the regular Camaro SS, which had easily cleared the production threshold on its own. That reclassification is what actually got the DZ 302 onto a Trans-Am starting grid in 1967, a workaround as much about accounting as it was about engineering. Buyers clearly didn’t mind the small first-year numbers once the car started winning: Z/28 production jumped to 7,199 for 1968, then to roughly 19,000 by 1969, as Chevrolet layered on cross-ram induction, four-wheel disc brakes, and additional gear ratio options to keep pace with what Ford and Pontiac were building to answer it.

The paperwork loophole paid off almost immediately. Roger Penske’s team, with Mark Donohue driving the Sunoco-blue Camaro, took the DZ-302-powered Z/28 to the final two races of the 1967 season and won both of them, even though Ford still claimed that year’s manufacturer’s title. The SCCA inspected Donohue’s car closely enough afterward that it briefly got sidelined over legality questions — a fitting coda for a program that had started by bending the rules in Chevrolet’s favor. Penske and Donohue came back for 1968 and simply dominated, winning the bulk of that season’s Trans-Am races and taking the championship outright. They repeated as champions in 1969, cementing the Z/28 as the car that had to win races to justify the engineering shortcut that got it certified in the first place.

That racing pedigree is the reason a numbers-matching 1967 or 1968 DZ-code Z/28 commands real money today, and why an unverified one still draws a crowd of skeptics instead of an easy bidding war.

The Rest of the Lineup Tells the Same Story

The Z/28 wasn’t the only car in this walk-through carrying a history lesson under its hood. The Barracuda Formula S represented Plymouth’s answer to the small-but-serious pony car formula — a Valiant-based coupe that traded outright muscle for a genuinely good-handling chassis, years before the E-body ‘Cuda made the nameplate famous for its big-block options. The Mustang Boss 351 sat on the opposite end of that spectrum: Ford’s answer to tightening emissions rules in 1971, built around a high-revving 351 Cleveland small-block engineered specifically to make real power without the displacement of a 429. It’s one of the more underrated Mustangs of the era precisely because it arrived the same year Ford discontinued the Boss 302 and 429, and it never got the marketing push either of those cars received.

Then there was the split-window Corvette, a design detail Chevrolet used for exactly one model year. The divided rear glass on the 1963 Sting Ray coupe looked striking but cut rearward visibility badly enough that Chevrolet dropped it after a single season, which is exactly why collectors treat any genuine 1963 split-window as a different, more valuable animal than every Corvette that came after it. A Comet S22 convertible and a Galaxie 500XL rounded out the lineup as reminders that Ford and Mercury were building genuinely sporty, V8-powered convertibles well before the muscle car era hit full stride, even if those cars rarely get the attention a Mustang or Shelby pulls today.

Why a Swap-Meet Z/28 Still Sparks an Argument

That history is exactly why a Z/28 showing up at a regional auction — rather than a marquee Mecum broadcast — still gets attention. Genuine first- and second-year DZ-302 cars are thin on the ground, and decades of reproduction parts, re-stamped data plates, and “tribute” builds have made verifying one a real skill rather than a glance at a fender badge. When this particular car crossed the block, viewers in the comments split almost immediately: some treated the sale price as a steal for a numbers-matching homologation car, while others flatly argued it wasn’t a real DZ-code Z/28 at all, just a clone wearing the right badges. Neither side had a VIN decode or build sheet to settle it on camera, which is precisely the situation that’s made Z/28 authentication its own cottage industry among Camaro people.

The rest of the lineup carried its own smaller debates. A big-block Mustang with a 429 under the hood drew comments calling it the bargain of the day. A 1970 Chevelle’s number raised eyebrows for the other reason — buyers thought it sold for more than the car’s condition justified. A Corvette with an LT-1 and a rare deluxe interior option drew praise as a smart buy if the frame checked out. None of it was staged controversy; it’s just what happens when real collectors price real cars in front of a camera instead of a TV broadcast with professional bid spotters managing the room.

What Makes This Kind of Auction Footage Worth Watching

Televised auctions polish away a lot of what makes buying a classic car risky and interesting. A walk-through like this one doesn’t. You see the same arguments a buyer would actually have in the lane — is that badge real, is that paint original, is that price fair — played out by anonymous bidders and secondhand reporting rather than a paid analyst with a script. For a car like the Z/28, built in the first place to dodge a rulebook it couldn’t technically satisfy, that kind of lingering doubt feels fitting. The DZ 302 was never meant to be easy to pin down; apparently, 59 years later, neither is confirming which ones are real.

Watch the full video above and let us know your thoughts in the comments.