Hell and Back Fully Loaded Stage 3 Cylinder Head — ISX-15 DOHC

A fully loaded Stage 3 head for the dual-cam Cummins ISX, with Inconel valves on both sides.

Hack Nation's fully loaded Stage 3 cylinder head for the dual overhead cam ISX. Fewer of these engines run every year, and the owners who keep them want them done right. This one is on our shelf.

What makes it better

• Inconel intake and exhaust valves. A high-temperature nickel alloy on both sides of the head, for maximum heat resistance. Stage 2 heads get Inconel on the exhaust side only.
• Up to 30% larger cooling ports. More coolant flow through the head, for lower metal temperatures.
• Upgraded casting with 5–15% more nickel. A stronger, more heat-tolerant casting than standard.
• Fully loaded. Arrives as a complete assembled head, ready to install, not a bare casting.

Why it matters

• Heat is what kills heads. Inconel holds its strength at exhaust temperatures that wear out standard valves, and the bigger cooling ports and higher-nickel casting carry that heat away.
• Stage 3 is the benchmark. Going from Stage 2 to Stage 3 is all about the valves, and Stage 3 is the starting point for every head Hack Nation builds.

The Hack Nation stage ladder

Stage 1 is OEM-style. Stage 2 adds the bigger cooling, higher-nickel casting and Inconel exhaust valves. Stage 3 adds Inconel intake valves. Stage 5, Hack Nation's in-house head, builds on Stage 3 with Hell and Back coated cam bearings, superfinished valve springs and rocker shafts, on a CGI casting when available. Ask us about stepping up.

What's included

A fully loaded, assembled Stage 3 cylinder head.

Fitment

Cummins ISX dual overhead cam (DOHC) only: CM870/CM871 twin-cam engines. Not for single-cam ISX15 or X15. Cross-reference: 5658283.

Send us your ESN or CPL and we'll confirm fitment before it ships.

Doing the head? Do the bolts. Pair it with our matching Hell and Back head bolt kit.

Backed by Hack Nation's 1-year parts warranty (terms apply).

Pickup in Grande Prairie or freight quoted after order. Questions? support@northernrepairltd.com or 587-297-9269.

Northern Repair LTD is a Hack Nation dealer in Grande Prairie, AB. Pickup at 3902 99 St.