Sold on an exchange basis - A rebuildable core exchange is required.SBT's Short Blocks are ready to install, just bolt on your head and the rest of your externals. The shortblock is an assembled lower unit that comes with the head and valve cover gaskets.Engine installation kit is optional.This SBT short block is for the large earth plateAt this time the item you are selecting is sold on a cores first basis, please call an SBT Sales Associate on sending the correct components to SBT. The lead time average for turn around is approximately 5-10 business days. Once SBT receives the core, this core has entered the remanufacturing process and cannot be returned.