Engineered in the UK but produced and assembled in Stillwater Oklahoma by specialty engine builder Mercury Marine, the all-aluminum LT5 shared only the 4.4 inch bore spacing with any previous sbc engine. It does "not" have reverse cooling and is generally not considered a small block Chevrolet. Used only in Corvettes, the LT5 was the work of a team headed by Design manager David Whitehead, and was hand built by one headed by project engineer Terry D. Stinson. It displaced and had a bore x stroke instead of the usual and featured Lotus-designed DOHC 4 valves per cylinder rather than the usual Chevrolet 16-Valve OHV Heads. The preproduction LT5 initially produced , but was reduced to and for the 1990-1992 Corvette ZR-1. The power ratings jumped to at 5800 rpm and of torque at 5200 rpm from 1993 until its final year in 1995, thanks to cam timing changes and improvements to the engine porting. 1993 also added 4-bolt main bearing caps and an exhaust gas recirculation system. A second generation of the LT5 was in the testing phase as early as 1993. What little information survived showed that it would have used a dual plenum system similar to the first generation Dodge Viper as well as variable valve timing. The next generation LT5 was set to produce between and . Unfortunately, the cost to produce the LT5 along with its weight, dimensions (would not fit the C5 pilot cars without extensive modifications) and internal GM politics over using an engine that was not designed and built in house killed the LT5 after six years of production. GM canceled the ZR-1 option beginning model year 1993. Engines that were to be installed in the as yet unbuilt ZR-1's were sealed and crated for long-term storage. After they were built at the Mercruiser plant in Stillwater, Oklahoma they were shipped to Bowling Green, Kentucky and stored in the Corvette assembly plant until the 1994 and 1995 ZR-1s went down the assembly line. A total of 6,939 cars were produced. The LT5 however wasn't an evolutionary dead end. Despite being discontinued, a new class of premium V8s for Cadillac and eventually Oldsmobile, the dual overhead cam V8 Northstar and its derivatives, drew heavily from the LT5's design and lessons learned from its production. GM also took lessons learned from producing a completely aluminum engine and applied them to the new LS series of engines. The LT5 was available on the following vehicles:  The L99 V8, produced from 1994–1996, shared a cylinder bore with the but had a stroke compared to of the .