Description
Power Driven Diesel | 12v Street Conical Valve Spring Set
Set of 12 high performance drop-in valve springs for the 12v Cummins cylinder head.
These light-weight valve spring assemblies are designed for maximum valve control up to 5000 RPM, perfect for a hot street Cummins diesel.
Springs feature 175 lbs of seat pressure, and 375 lbs open pressure.
These street performance valve springs will accommodate the vast majority of performance street camshafts on the market while still maintaining reasonable open pressure for cam lobe and lifter/tappet life.
As with any aftermarket valve spring upgrade with higher than stock pressure, it’s recommended that a higher quality engine oil is used to protect the cam and tappets.
Kit contains: 12 conical valve springs, 12 chromoly steel retainers, 24 lock halves (enough for 12 valves)
These street conical springs, retainers, and locks are designed to drop-in at a 1.950″ installed height and 175 lbs of seat pressure.
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.
Power Driven Diesel | 12v Street Conical Valve Spring Set Set of 12 high performance drop-in valve springs for the 12v Cummins cylinder head. These light-weight valve spring assemblies are designed for maximum valve control up to 5000 RPM, perfect for a hot street Cummins diesel.
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.
