Powerstroke Products O-Ring Heads NEW 2003-2007 Powerstroke Dowel size:18mm Powerstroke Products includes the correct

Powerstroke Products includes the correct head gasket and fire rings for installation while backing their head with a 1 year unlimited mileage warranty

This allows more flow from the injector nozzle

Loaded Head

These injectors are roughly 200HP over stock

High-silicon Ductile Iron

Powerstroke Products O-Ring Heads NEW 2003-2007 Powerstroke Dowel size:18mm Powerstroke Products includes the correctFEATURES: Loaded Head For 18mm Dowels Machined for O Rings New Valves, Springs, & Seals 1 Year Unlimited Mileage Warranty Sold individually We also offer studs and head gaskets! (Sold separately) ATTENTION: 2003. 5 2006. 5 are 18mm heads, 2006. 5 2007 are 20mm heads.