Technically speaking, the rarest Buick engine ever made might be ... been based directly on the turbocharged Indy 500 pace car. The turbocharged V6 in the GNX is essentially a whole new build ...

Honda announced this weekend at the Mid-Ohio race that it will produce a new twin-turbocharged 2.4-liter V6 available ... five times in Indy 500 history - there was not a single engine failure.