Industrial Injection 4BT Engine Fire Ring/Port Valve Bowls/Exh Port/Mill Intake Off CNC Port Intake

The Industrial Injection 5.9L 12v Cummins Race Heads are designed for the racer / sled puller in mind. Fully CNC ported heads complete and ready to bolt on. Features include: Intake Shelf Machined Off To Accept Intake Runner, CNC Ported Intake & Exhaust Ports w/ Performance Hand Blending, Custom Performance Stainless Steel Nitride Coated Valves, Top Hat Valve Seals, Diamond Honed High Strength Hardened Alloy Valve Guides, Drilled & Tapped Coolant Freeze Plugs In Head, Radius Cut Fire Ring Grooves, Upgraded 150lb Valve Springs, and 7mm Injector Bore. Note: Fire Ring Head Gasket sold separately. Core charge of $700.00 on top of listed price.