Honda this week marked the 40th anniversary of production at the Anna Engine Plant, the company’s largest auto engine plant in the world.

The 2.8 million-square-foot facility in western Ohio is part of the automaker’s EV Hub, which is advancing the concept of flexible manufacturing to produce internal combustion en-gines, hybrid powertrains and all-electric motors on the same production lines, according to a news release.

The Anna Engine Plant has built more than 32.5 million engines, including for automobiles and power sports products, as well as a variety of powertrain components for engines and transmissions since it began production of motorcycle engines on July 22, 1985.

Production of auto engines began a year later, with a four-cylinder powerplant for the Honda Civic, the release detailed.

“Everything that Honda has accomplished at the Anna Engine Plant during the past 40 years has been achieved through the skills and commitment of our associates and this will continue as we pursue an expanded form of flexible manufacturing in the future,” said Michael Tinch, plant lead. “As we maximize production of ICE and hybrid models, even while preparing for the future of EV production, I know our associates will continue to produce high quality products that meet the needs of our customers.”

The plant currently produces a range of V-6 and inline four-cylinder engines, including 1.5-, 2.0- and 3.0-liter turbo engines.

The plant also produces a variety of components, including cylinder sleeves and heads, camshafts and crankshafts for Honda engines, as well as the high-precision pulleys used in the continuously variable transmission produced at the nearby Honda transmission facility.

Established as a 200,000-square-foot facility with 94 employees, Honda has over the years invested $2.9 billion into a sprawling facility that now employs 2,900 workers, with production operations ranging from ferrous casting, high-pressure die-casting and machining to heat treating and assembly.

Honda established domestic manufacturing operations in Marysville in 1979 with the start of motorcycle production. The company’s Ohio operations currently employ more 12,000 at five plants, representing a capital investment of $13 billion, the release noted.