GMC Sierra Peace and blessings of God be upon you. I am offering an LS1 engine with a capacity of 5.3. The only modifications are a new oil pump from Milodon to avoid lifter problems and extend the engine's life... and the 4-cylinder system (DOD) is deactivated. The engine is very clean, and the buyer has the right to inspect it. The car currently has 340,000 miles and is very clean, guaranteed not to have been opened before. The engine's front cover was only removed for maintenance of consumables.