Engine Coolant Return Pipe 2001-04 LB7 304SS Polished - 119001030 2003-gmc-sierra-2500-esi4517093 D-701-38) The OEM Duramax cast-aluminum

D-701-38) The OEM Duramax cast-aluminum cylinder heads fall short over time - the different heat expansion rates between cast-iron engine block and cast-aluminum cylinder head cause head gasket scrubbing and eventually blown head gaskets

3L Godzilla OHV V8 (This model uses two bolt sizes 12mm & 14mm

Quality -12AN fittings and stainless braided hose lines are durable and made to withstand high pressures and harsh conditions

Two threaded oil filter adapters are also included: 13/16 Inch-16 (fits PPE Filters and GM filters) and 1-Inch-12

The PPE intercooler is 77 percent less restrictive than the stock GM intercooler

Engine Coolant Return Pipe 2001-04 LB7 304SS Polished - 119001030 2003-gmc-sierra-2500-esi4517093 D-701-38) The OEM Duramax cast-aluminumSpecifically designed for use in conjunction with the factory thermostat housing. 304 stainless steel construction prevents corrosion compared with OEM mild steel pipe which is prone to rusting and eventually leaking. Allows for installation of factory turbo coolant return thermostat. Also great for marine applications. This Part Fits: Year Make Model Submodel Notes 2001 Chevrolet Silverado 2500 2002 Chevrolet Silverado 2500 2003 Chevrolet Silverado