1989-1998 Cummins 5.9L 12V Manton Conical Valve Spring Kit (D-105-KIT-12V)
1989-1998 Cummins 5.9L 12V Manton Conical Valve Spring Kit (D-105-KIT-12V) is backordered and will ship as soon as it is back in stock.
Shipping & delivery
Usually ships in 2–3 business days unless a different lead time is shown on this page. Shipping cost is calculated at checkout (UPS or USPS to the contiguous U.S.).
Shipping policy · Returns · Fitment questions? (561) 207-7988
Delivery and Shipping
Delivery and Shipping
Standard order processing is 2–3 business days unless this product or your order confirmation states a different lead time. Custom-built, made-to-order, backorder, and pre-order items follow their stated lead times.
Enclosures and subwoofer boxes ship for $50 per unit. Other shipping charges are calculated at checkout. Orders outside the contiguous 48 United States may require additional shipping; we will contact you for approval before shipment.
Subwoofer boxes ship UPS Ground where available. Read our Shipping Policy and Return and Refund Policy for delivery, product-specific return windows, and warranty details.
1989-1998 Cummins 5.9L 12V Manton Conical Valve Spring Kit (D-105-K...
1989-1998 Cummins 5.9L 12V Manton Conical Valve Spring Kit (D-105-KIT-12V) is backordered and will ship as soon as it is back in stock.
Description
Description
1989-1998 Cummins 5.9L 12V Manton Conical Valve Spring Kit (D-105-KIT-12V)
Upgrade your 12V 5.9L engine with Manton Heavy Duty Conical Springs, Billet Retainers & Lock Kit.
Ideal for engines running over 40psi and 3,700rpm; stronger pushrods recommended for this setup.
Protects valves from being pushed open under high boost conditions, enhancing efficiency and longevity.
Engineered for high boost capability and maximum valve train stability.
Perfect for stock rebuilds or high-performance race applications.
Lightweight 7-degree billet steel retainers designed to match conical spring shape, stronger than OEM.
Includes 7-degree valve locks designed for these retainers.
Heat-treated spring shims available in various thicknesses for adjusting seat pressure to accommodate max boost.
Fitment & installation
Fitment & installation
Check the selected part against your vehicle. Need help? Call (561) 207-7988.
Selected part: D-105-KIT-12V
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Read FOX’s application notes for part 987-24-001 (rear shock)
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