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In the late 1960s the ultimate muscle cars were the ZL-1 Camaros and Corvettes. The full racing motor featured an all aluminum block and cylinder heads and could be ordered as an option in 1969 on the Corvette or as a COPO (Central Office Production Order) on the Camaro. Because of the huge price of the engine, only two Corvettes and 69 Camaros were ordered with the ZL-1. Although the motor was officially rated at 430 horsepower and 450 lb-ft torque, independent tests showed upwards of 525 horsepower. Motor Trend tested a ZL-1 at the track with drag slicks in 1968 and pulled off a 10.89 @ 130 mph. It's easy to see why the ZL-1 name is legendary.

Now, using the recently-discovered tooling that was used to build the original engines, GM Performance Parts is offering a new anniversary edition of the ZL-1 engine. Some of the design features have been updated, and the block casting has been strengthened, but it's essentially the same motor in the ZL-1 Corvettes and Camaros of 1969. It's even officially (under)rated at 430 horsepower and 450 lb-ft torque. Only 427 examples will be produced, although if you can't get your hands on one of those, you can get a very similar ZZ427 crate motor. See all of the features of the new ZL-1 after the jump.

[Source: GM]


GRAND BLANC, Mich. – GM Performance Parts (GMPP) announced production plans for a new Anniversary 427 limited-edition crate engine and a regular-production ZZ427 crate engine. The Anniversary 427 is a modern re-creation of the mythical, all-aluminum ZL-1 427 engine. It is underrated at 430 horsepower and 450 lb.-ft. of torque – like the production engine was in 1969. Only 427 of the special engines will be built.

The new ZZ427 crate engine features most the Anniversary 427's high-performance design features and components, but is built with a more economical cast iron cylinder block – but still producing approximately 430 horses and 450 lb-ft. of twisting power. The ZZ427 enters the GM Performance Parts crate engine lineup as a regular-production power plant.

"Simply mentioning the term 'ZL-1' stirs the emotions of Chevy performance enthusiasts," said Lisa Reffett, marketing manager, GM Performance Parts. "By using the tooling that built the original engines, we're able to revive the spirit of that legend and re-introduce it to not only enthusiasts who missed their opportunity to own one 40 years ago, but to a new generation of Chevy high-performance fans."

The 427 copies of the Anniversary 427 go on sale in the first quarter of 2008 through GM dealers and authorized GM Performance Parts retailers. Each engine also comes with a complementing Anniversary Edition package that includes a certificate of authenticity, an engine plate with specifications and a matching number owner's kit to add to its exclusivity.

"The Anniversary 427 is a special engine, and the lucky customers who buy one will know they got something unique," said Reffett. "Cars are collectable and we're sure the Anniversary 427 will be, too."

ZL-1 tooling

Production of the Anniversary 427 was inspired by the discovery of the signature aluminum block's tooling several years ago. It was discarded after production of the original ZL-1 engine halted in the early 1970s.

GM Performance Parts oversaw the refurbishment of the tooling and updated some design features of the cylinder block, such as the addition of screw-in galley plugs. The block casting also was strengthened in key areas. The result is a modern interpretation of the legendary engine that is infused with all of the high-performance attributes of the original.

The all-new Anniversary 427 has a classic, single four-barrel carburetor induction system that is similar to the four-barrel setup of the original ZL-1 engine. (GMPP offered a port-fuel-injected "Ram Jet ZL-1" crate engine a few years ago, with a block based on the refurbished aluminum ZL-1.)

Anniversary 427 and ZZ427 engine details

The limited-production Anniversary 427 – GM part number 19166392 – and regular-production ZZ427 – 19166393 – share similar design traits that combine with carefully selected components from the GM Performance Parts catalog to produce approximately 430 horsepower and 450 lb.-ft. of torque; it's just that the Anniversary 427 uses the special, re-tooled aluminum cylinder block casting.

These new 427 engines accept all of GMPP's front-end accessory drive systems and lightweight starters. Customers will need to supply fuel system and exhaust system components as needed for their application.

ZL-1 history

The 427-cubic-inch ZL-1 engine was born in the late 1960s as a lightweight weapon for use in road racing and the first few were handed out to racing teams supported by Chevrolet. The aluminum block offered an approximately 100-pound weight savings over the conventional iron big-block casting.

Dealers got wind of the engine, which was said to make more than 500 horsepower when properly tuned, and a few production cars were ordered under Chevy's "COPO" system – a special-order system that was used mostly for fleet vehicles, such as utility trucks or taxi cabs. COPO stood for Central Office Production Order, and the dealers exploited the rules of the system to custom-build the ultimate muscle cars.

In all, 69 1969 Camaros and a pair of 1969 Corvettes were built with the ZL-1 engine as standard equipment. Most of the vehicles were ordered with few options, as they were intended to be sold to drag racers. Nearly 40 years later, they are the most prized and valuable Chevy models of the muscle car heyday.

While production cars with the ZL-1 engine were available for only a year, Chevrolet continued to manufacture and sell ZL-1 engines and parts over the parts counter to racers through the early 1970s. So, while the ZL-1 engine program ended, its legacy lingered for decades.

GM Performance Parts crate engines undergo a 50-hour, full-throttle engine dynamometer validation, requiring the engines perform from peak horsepower to peak torque. GMPP also installs crate engines in its own engineering vehicles for ongoing testing and continuous improvement. This commitment to quality and durability allows General Motors to back GM Performance Parts crate engines with a 24-month / 50,000-mile warranty (whichever occurs first). All GM Performance Parts components carry a 12-month / 12,000-mile warranty.

Enthusiasts who crave the latest technology, maximum horsepower and the expertise and confidence backed by GM can purchase GMPP crate engines, blocks, heads and components from GMPP Authorized Center dealers or any other GM dealership nationwide. For more information or to locate the closest GM dealership visit www.gmperformanceparts.com or call 800-577-6888.

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    • 1 Second Ago
      • 7 Years Ago
      I've never heard of this engine before (it was way before my time), so I am seriously interested in learning about the history behind this rare engine. They actually used aluminum back in the 60's? 500+ hp in the 60's? What kind of state of the art monster are we talking about? lol
        • 7 Years Ago
        COPO Camaros, they were factory hot rods that were transformed into the Yenko Camaros for the most part. They had stripped down styling, painted steel wheels, and nothing that said COPO on the outside. But my god, they were mean
        • 7 Years Ago
        don't forget they used gross hp or something back then. i.e. 500hp turns out to be something like 400hp by today's standards. Often the manufacturers would either lie or simply put a whole lot of go faster bits not available to most of the public on the engine they put on the dyno. Hence all the 'zomg muscle cars back in the day had like 400hp underrated by factory'.
        still, impressive for back then and usually a lot of torque, and a lot of fun.
      • 7 Years Ago
      Makes me want to run out and find one of the last ('87-ish) Monte Carlos and drop one in. That or a '96-ish Suburban. Z. L. One. The kittens that were killed for the Ugliest Mustang Ever, God just brought them back to life!
      • 7 Years Ago
      Does anyone know a way to check and see if someone ordered one of the original 69 of the 1969 Camaro's with this motor?

      There is a small chance that my late father may have ordered one of the original 69 camaro's with this motor as he worked for over 30 years for GM and did some amateur drag racing, I know there was something special about it, just not sure though...it's a small chance but curious nontheless.
      • 7 Years Ago
      TigerMill: 40 years stretches the memory but Baldwin, Yenko and others put that motor in a number of vehicles including Novas and Chevelles. And chevy did a land office business in ZL-1 trim pieces that showed up on anything.
      • 7 Years Ago
      Eh. 68 Hemicuda or 69 HemiDart. Fastar!!!!!
      • 7 Years Ago
      My dad knows a guy in Marion, Iowa that has the largest collection of COPO Camaro's in the world and also owns the lowest mileage COPO Camaro in existence. I've driven past his place many times but never been lucky enough to see his collection.
      • 7 Years Ago
      I work at GM Powertrain (transmissions) and I'm all for the ZL1.. but didn't they already 'release' a limited run of new-edition ZL1s?

      Instead of 427, they released a 454 ZL1 Ramjet.


      What they need to release is an all-aluminum SMALL BLOCK (old style)! The ZL1 is a thumper, but who wants to build a big block when small block parts are just as powerful and cheap?
        • 7 Years Ago
        You can get tons of horsepower from a smallblock, but if the same build ratios, componetry and support parts are used with both engines, the bigger, the better is usually true. This is why there are limits to engine displacement in almost all racing like Nascar, SCCA, etc. To say smallblocks will perform as well as big blocks is to be taken with many caveates. Weight, stroke, bore, horsepower, compression, intake, camshaft, as well as literally hundreds of other variables make for untold differences in performance. Money is usually the factor that determines performance, not the size of the powerplant. Given enough money, any argument can find support. However, in the end, bigger is usually better, unless you happen to be married to it.
      • 7 Years Ago
      Yeah, well, we had one of these ZL-1 engines in a Chevy Nova (apparently more than a few Novas had them), dunno whether it was COPO, maybe Baldwin. But it threw a rod and we replaced the effing aluminum block with an iron block. IIRC it was $3,000 just to replace the aluminum block in 1969!!! A whole new small block corvette car cost less than $6K.
      Car would wheelstand across the intersection...
      Anoka, MN.
      • 7 Years Ago
      I've been searching for tech info on the new ZZ427 for weeks now. I cant even figure which block they used to put this thing together, unless its not available yet. Im also trying to figure if its based on a Gen IV, V, or VI big block. I am very familiar with all the gen IV parts, but im not sure what to think about this one. It seems to be a morph of some sort with the one piece rear main seal. I would love to find a complete part number list for the new ZZ427 crate so I can figure out specs on the thing. I would like to try putting together a high compression, high RPM version like the old L-88, L-89, and ZL-1's.
      • 7 Years Ago
      They didn't just discover this. They've been waiting to drop it into something like, I don't know, the 2009 Camaro?
      • 7 Years Ago
      The ZL1 was the most powerful engine of the muscle car era ever put into a production vehicle. Also the most rare.

      Though to make its full power it needed the factory optional headers (dealer installed).
      • 7 Years Ago
      i wonder if it will fit into the back end of a chevy aveo hatch? the next generation "ford shogun!"
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