Fleece Performance and Freedom Racing bring you the Heavy Duty Street cylinder head for the 2007.5–2018 common rail 6.7L Cummins — the step up from the Street head for builds that demand added durability under sustained performance use. Every head is inspected, pressure checked, decked, painted, and ready for installation. Rated for 700 HP and ready to bolt on.

The Heavy Duty Street head builds on the full Street foundation with the addition of Fleece 105 valve springs and heavy duty tool steel retainers — components that ensure long-term reliability under higher heat cycles, aggressive tunes, and demanding towing or sled pulling applications where a standard valve spring simply is not enough.

All street heads come standard with 11 screw-in freeze plugs to eliminate coolant leaks, oversized and hardened valve seats, new Cummins valve springs, and new valve guide liners.

Looking for the next level? The Performance head adds Manley stainless steel valves, a fire ring cut, a fire ring head gasket set, and a 1100 HP rating.

Heavy Duty Street head features: 11 screw-in freeze plugs, oversized and hardened valve seats, new Cummins valve springs, new valve guide liners, Fleece 105 valve springs, heavy duty tool steel retainers, 700 HP rating, fully inspected and pressure checked, decked and painted, bolt-on ready.

Core charge: A $500 core charge applies to this order. This amount will be refunded once Fleece Performance receives your core cylinder head and it is marked as a good core.

Shipping: Flat rate of $200 to all lower 48 states. Contact us for a shipping quote outside the contiguous US.