Description

The PDM-67RHS2 is Industrial Injection's Stage 3 race head for the 2007.5-2018 6.7L Cummins. On top of the Stage 1 race-spec internals, this head adds CNC-blended porting and polishing of the intake and exhaust ports plus machined fire ring grooves in the deck surface — built for high-cylinder-pressure builds running fire rings. CNC porting on a 5-axis machine takes the head to 285 CFM @ .450 lift (vs. 165 CFM stock), with each port flowing identically to balance cylinder-to-cylinder power.

Part Number: PDM-67RHS2

Features

• Stage 3 race head — ported & polished
• 5-axis CNC porting, hand-blended on intake and exhaust ports
• 285 CFM @ .450 lift (stock is 165 CFM)
• Custom-port oversized 36mm stainless steel valves with nitrate coating
• Fire ring grooves machined into the deck surface
• High-strength alloy heat-treated iron-based valve guides (Rockwell 22C), diamond-honed
• Premium nickel-based non-magnetic valve seat inserts
• 120lb performance valve springs (USA-made, in-house tested)
• Drilled and tapped steel coolant freeze plugs
• Milled and surfaced

Notes

• 36mm valves will not clear a 5.9 bore — must have at least a 4.125 bore to clear.
• Intake runner milled off to accept ZZ Fab intake (sold separately).
• Designed to run with a fire ring head gasket — confirm gasket and stud package before ordering.
• Head studs and head gasket sold separately.
• Core deposit applies — keep your old head and return it to recover the deposit.