Product Description
CNC Fabrication 421009 94.5-03 7.3L Stage 2 Valve Spring Kit
The CNC Fabrication 421009 Stage 2 Valve Spring Kit is designed for 1994.5-2003 Ford 7.3L Power Stroke engines requiring increased valve control in high-horsepower and performance applications. Intended as an upgrade over CNC Fabrication's Stage 1 valve springs, this kit is recommended for engines producing over 500 horsepower and provides improved valve train stability at higher engine speeds and increased boost levels.
Featuring premium valve springs, retainers, and keepers, the CNC Fabrication 421009 kit helps prevent valve float while supporting aggressive performance builds. With a 155-pound seat load, 377-pound open load, and support for up to .600-inch valve lift, this kit is an excellent choice for towing, competition, and high-performance 7.3L Power Stroke applications.
Important: Valve seals and shims are not included. Proper installed height must be measured and shimmed during installation.
Features
- Designed for 1994.5-2003 Ford 7.3L Power Stroke engines
- Recommended for engines producing over 500 horsepower
- Stage 2 performance valve spring upgrade
- Improved valve control and valve train stability
- Helps prevent valve float at elevated RPM levels
- Includes new valve spring retainers
- Includes new valve keepers
- Supports up to .600-inch valve lift
- Ideal for performance, towing, and competition applications
- Built specifically for Ford Power Stroke engines
Fitment
- 1994.5 Ford 7.3L Power Stroke
- 1995 Ford 7.3L Power Stroke
- 1996 Ford 7.3L Power Stroke
- 1997 Ford 7.3L Power Stroke
- 1998 Ford 7.3L Power Stroke
- 1999 Ford 7.3L Power Stroke
- 2000 Ford 7.3L Power Stroke
- 2001 Ford 7.3L Power Stroke
- 2002 Ford 7.3L Power Stroke
- 2003 Ford 7.3L Power Stroke
Note: This kit does not include valve seals or shims. Installed height must be measured and adjusted using appropriate shims during installation. Professional installation is recommended.
What's Included
- Stage 2 Valve Springs
- Valve Spring Retainers
- Valve Keepers
Specifications
- Manufacturer: CNC Fabrication
- Part Number: 421009
- Application: 1994.5-2003 Ford 7.3L Power Stroke
- Kit Type: Stage 2 Valve Spring Kit
- Installed Height: 1.880 Inch
- Seat Load: 155 lbs @ 1.880 Inch
- Open Height: 1.280 Inch
- Open Load: 377 lbs
- Maximum Recommended Valve Lift: .600 Inch
- Spring Rate: 370 lbs/in
- Coil Bind Height: 1.210 Inch
- Valve Seals Included: No
- Shims Included: No
- Retainers Included: Yes
- Keepers Included: Yes
- Recommended Power Level: 500+ Horsepower Applications
Cross Reference Numbers
421009, CNC421009, 7.3 Stage 2 Valve Springs, 7.3 Power Stroke Valve Spring Kit, 7.3 Performance Valve Springs, Ford 7.3 Valve Train Upgrade
FAQ
Who should use the CNC Fabrication 421009 Stage 2 Valve Spring Kit?
This kit is designed for performance-oriented 7.3L Power Stroke builds and is recommended for engines producing over 500 horsepower.
Does this kit include valve seals?
No. Valve seals are not included with the CNC Fabrication 421009 Stage 2 Valve Spring Kit.
Are installation shims included?
No. Proper installed height must be measured and adjusted using the appropriate shims, which are not included.
What valve lift can these springs support?
The springs are designed to support up to .600-inch valve lift when properly installed.
What is the seat pressure of these springs?
The springs provide 155 pounds of seat load at the specified 1.880-inch installed height.
Do retainers and keepers come with the kit?
Yes. The kit includes new retainers and valve keepers for installation.
Why upgrade to Stage 2 valve springs?
Stage 2 valve springs provide increased valve control and help prevent valve float in high-performance applications with elevated RPM, boost, and horsepower levels.
