Chevrolet has announced that it will return to the IndyCar Series as an engine supplier when the championship launches its new rules package in 2012.
Multiple championship-winning team Penske has already committed to the engine, which will be a turbocharged V6 created in collaboration with renowned engine builder Ilmor.
The deal confirms that IndyCar will feature manufacturer competition again for the first time since Chevrolet and Toyota's exit in 2005. Honda has powered the whole field since then.
IndyCar boss Randy Bernard said: "We are excited to have engine manufacturer competition again in the IZOD IndyCar Series, beginning in 2012. Chevrolet brings a strong passion for racing, technology, relevance and innovation, which is a great fit for our new car platform.
"We are excited about the future of IndyCar racing with the addition of Chevrolet."
Chevrolet originally entered the American single-seater scene with Penske in 1986, supplying Champ Car engines through to 1993. Parent company General Motors then used the Oldsmobile brand when it joined the Indy Racing League in 1997, but reintroduced the Chevrolet title from 2002.
Chevrolet's vice president of marketing Chris Perry said IndyCar was an ideal platform for the company's motorsport efforts.
"Indianapolis Motor Speedway has been a proving ground for manufacturers since Louis Chevrolet, our co-founder, first raced here in 1909," said Perry.
"Our return to IndyCar as Chevrolet enters its centennial year is natural. At the same time this engine program,e will be a showcase for the efficient, and powerful, engine technologies that parallel new Chevrolet vehicles like the Camaro, all-new Cruze compact and Equinox crossover."