(Special Order) The Boss 5.0 block is a 4.6L deck height, 94mm cylinder bore cast iron block. The block uses a proprietary iron mix to yield the strongest possible casting strength with the least porosity and greatest consistency. NOTE: The Boss 5.0L  modular block does not have a finish milled head deck surface and the cylinder bores are rough honed.  Siamese 94mm bore 17mm main web minimal thickness 4 Bolt main with interference fit nodular iron machined caps Increased main web window size for improved crankcase breathing  Head gaskets for 3V applications use M-6067-3V50 for all others contact Cometic® Gasket For installation in 2005-2010 Mustangs use engine mount adapter M-6031-BOSS50 Weighs approximately 165 lbs Part Type Engine: Engine Blocks Warranty Availability Not Available Packaged Dimensions 19″ x 14.5″ x 21 Packaged Weight 180 lb(s) UPC Code 756122097786 Catalog Page Number 147 Country of Origin United States