sentences:  However, testing showed that the engine was not as reliable as hoped.After installation of it in the road car, Lotus teams were left to decide whether or not to use the Lotus V8 or opt for a Chevrolet LT5 5.7 L V8 engine from the Chevrolet Corvette ZR-1, a car which Lotus had jointly developed when they had been under the ownership of General Motors.Lotus further developed the LT5 by fitting it with a flat-plane crankshaft, adding two turbochargers and increasing its displacement to 6.0 L for the Elise GT1 Race car.