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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