Description
PDI | Big Boss Cummins X15 SOHC Stage 1 Cylinder Head
Please contact us for product pricing.
Available for: 2010-2025 Cummins ISX and X15 Engines
Key Benefits
- High Nickel Casting
- Inconel Exhaust and Intake Valves
- Stainless Retaining Clips
- Made in the USA
Warranty: 2 Year Unlimited Mileage
PDI Big Boss Cummins ISX/X15 Stage 1 Cylinder heads are meticulously designed to surpass the most demanding expectations, making them the perfect choice for heavy-duty applications in trucking, construction, agriculture, and more.
They exemplify our unwavering dedication to innovation and superior quality.
Each Stage 1 Cylinder Head is built with all Inconel valves, known for their exceptional strength and resistance to extreme temperatures, ensuring unparalleled durability and performance.
Shipped Australia-Wide
- Dispatched from within Australia with tracking.
- Same-day dispatch on in-stock orders placed before 11am AEST, Monday–Friday.
- Shipping is calculated at checkout based on size, weight and your delivery address.
- Estimated delivery 2–7 business days depending on your location.
Freight question? Call us on (07) 5619 7869.
PDI | Big Boss Cummins X15 SOHC Stage 1 Cylinder Head Please contact us for product pricing.
Double Duty Diesel — Manufacturer Pass-Through Warranty
Double Duty Diesel parts carry the original manufacturer's warranty:
- Fluidampr — Lifetime warranty on harmonic balancers
- MAHLE / Clevite — 12 months on bearings, gaskets, sealing components
- Dynomite Diesel — 12 months on stock-spec injectors and pumps; performance/race spec varies
- Power Driven Diesel — 12 months on turbos and bundled tuning kits
- Returns must be notified within 30 days of delivery
- Parts only — installation not covered
Workshop fitment available at Willys for transmissions, injectors and engine internals.
Read the full Double Duty Diesel warranty terms →
Warranty claims are coordinated through Willys Workshop. Email sales@willysworkshop.com.au or call Warana (07) 5619 7869 / Oxley (07) 3377 3421 with your order number and a description of the issue.
