As is usually the case with such things, the unique manufacturing facility for the Chevrolet Corvette Z06 (LS7) and ZR1 (LS9) engines is about as nondescript as it gets. Located in the faceless Detroit suburb of Wixom, Michigan, GM’s Performance Build Center is tucked away at the end of a winding road, at the back of a totally anonymous industrial park—in the shadow of an enormous and defunct Ford plant that built Lincolns, Thunderbirds and more.
There is no sign directing visitors to the building, let alone the banners and searchlights an enthusiast would expect for the location where ultra-high-horsepower engines are born. You have to know where it is, and even then it’s easy to make a wrong turn in the labyrinth of cookie-cutter industrial buildings within the park.
But once you’re inside its brightly lit and antiseptically clean environs, the Performance Build Center (PBC) makes a different impression, one that’s unique. With most employees laboring by hand, it has the personable intimacy of a race shop, yet it also has the computer-tracked quality assurance systems found in mainstream assembly facilities. The combination of old-world techniques and 21st-century technology makes for a real dichotomy.
Although the PBC is technically a manufacturing center like others in GM’s network, it differs in a fundamental way: Rather than a conventional assembly-line process, each engine is assembled by hand by a single technician. That means from the moment the crankshaft is laid in the block until the last intake manifold bolt is tightened, one person is responsible for it all—and he signs off on every LS7 or LS9 engine he builds.
“The LS7 and LS9 engines are premium products that demand a premium manufacturing technique,” said Tom Stephens, GM Vice President for Global Powertrain and quality. “The processes at the Performance Build Center bring a higher level of quality, because each builder is personally involved in all aspects of the assembly, helping ensure the Corvette Z06 and ZR1 deliver their world-class performance with exceptional durability and reliability.”
The PBC also is responsible for assembling the LS3 engines used in Grand Sport coupe models equipped with manual transmissions. These 6.2-liter V8s feature a dry-sump oiling system like those found in the LS7 and LS9, which is why it makes sense for them to be built in Wixom.
Just in case you’re wondering, the engine used in the Cadillac CTS-V—the LS9-based LSA—is not built at the PBC, but rather at a facility in Mexico. Previously, the supercharged version of the Cadillac Northstar V8 was assembled here. With that engine’s demise, the PBC became an all-Corvette shop.
We recently visited the PBC to view the creation of an LS9. It began with builder Rick Dadd selecting an engine block and the necessary rotating components from the “grocery store”—a room filled with mouth-watering stacks of titanium connecting rods, forged steel crankshafts and lightweight pistons. The block was mounted to a movable stand on which the entire engine would be built, then Dadd moved it to the first of approximately 15 stations that form a U-shaped assembly area. Each station contains the specialized tools required to perform specific procedures.