Industrial Injection GM Race Short Block For 2004.5-2005 6.6L LLY Duramax - PDM-LLYRSBIndustrial Injection 2004. 5 2005 6. 6L LLY Duramax Race Short Block Engine. The Industrial Injection Race Duramax Short Block was designed for those who are looking to push the limits of performance to the ultimate level. These are designed to be reliable for competition use. We use the highest quality parts and machining processes in every engine build, guaranteeing you the up most reliability and precision to have the best performing engine on the