Buick Indy V6 engine

The Buick Indy V6 was a turbocharged V6 racing engine of 3.0 to 3.4 litres that Buick designed and built for Indy car racing between 1982 and 1997. It shared its architecture with the Buick V6 road engine and, as a pushrod stock-block design, was allowed a higher turbocharger boost limit by the Indianapolis 500's sanctioning body than the CART series permitted, which made it attractive to smaller teams. It never won a CART race but did well at Indianapolis, taking the pole in 1985 with Pancho Carter and in 1992 with Roberto Guerrero, who was also the first driver to break 230 miles per hour in time trials, and Al Unser Sr. finished third in 1992. It was notoriously unreliable over 500 miles. A derivative, the Menard V6, ran from 1993 to 1996 without Buick factory support.