Product Description
CNC Fabrication 421006 94.5-03 7.3L Stage 1 Valve Spring Kit With Spring Shims
The CNC Fabrication 421006 Stage 1 Valve Spring Kit is a performance valve train upgrade designed for 1994.5-2003 Ford 7.3L Power Stroke diesel engines. Engineered as a mild upgrade over factory valve springs, this kit helps improve valve control, stability, and durability in stock and moderately modified engines while maintaining excellent drivability.
Ideal for 7.3L Power Stroke builds producing up to approximately 500 horsepower, the CNC Fabrication Stage 1 Valve Spring Kit includes 16 valve springs and spring shims for proper installation. Designed specifically for the 7.3L Power Stroke platform, these springs provide increased seat and open pressure compared to factory springs, helping maintain valve control under higher boost levels and increased engine loads.
Backed by CNC Fabrication's extensive experience with Ford Power Stroke performance applications, this kit is an excellent choice for daily drivers, towing vehicles, and mild performance builds seeking improved valve train reliability.
Features
- Designed for 1994.5-2003 Ford 7.3L Power Stroke engines
- Stage 1 performance valve spring upgrade
- Improved valve control compared to factory springs
- Ideal for stock and mild performance applications
- Recommended for engines up to approximately 500 horsepower
- Includes valve spring shims
- Increased seat and open pressure for improved valve stability
- Helps reduce valve float under increased boost and RPM
- Engineered specifically for the 7.3L Power Stroke platform
- Designed and supported by CNC Fabrication
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
- 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: Proper installation procedures and valve train inspection are recommended when replacing valve springs. Always verify installed height and valve train compatibility before installation.
What's Included
- (16) CNC Fabrication Stage 1 Valve Springs
- Valve Spring Shims
Specifications
- Manufacturer: CNC Fabrication
- Part Number: 421006
- Application: Stage 1 Valve Spring Kit
- Engine Compatibility: 1994.5-2003 Ford 7.3L Power Stroke
- Spring Outside Diameter: 1.354 Inch
- Spring Inside Diameter: 0.940 Inch
- Seat Load: 119 lbs @ 1.800 Inch Installed Height
- Open Load: 312 lbs @ 1.350 Inch
- Spring Rate: 458 lbs/in
- Coil Bind Height: 1.280 Inch
- Maximum Recommended Valve Lift: Approximately 0.510 Inch
- Quantity: 16 Springs Per Kit
- Includes Shims: Yes
- Recommended Power Level: Up to Approximately 500 HP
Cross Reference Numbers
421006, CNC421006, 7.3 Valve Spring Kit, 7.3 Stage 1 Valve Springs, 7.3 Power Stroke Valve Spring Upgrade, Power Stroke Valve Train Kit
FAQ
What is the CNC Fabrication 421006 valve spring kit designed for?
This kit is designed as a performance upgrade for 1994.5-2003 Ford 7.3L Power Stroke engines to improve valve control and reliability compared to factory valve springs.
How much horsepower can these springs support?
CNC Fabrication recommends this Stage 1 kit for engines producing approximately 500 horsepower or less, making it an excellent option for towing, daily driving, and mild performance builds.
Are spring shims included?
Yes. The kit includes valve spring shims to assist with proper installation and installed height setup.
How many valve springs are included?
The kit includes sixteen valve springs, enough to service a complete 7.3L Power Stroke engine.
What is the maximum recommended valve lift?
The springs are designed for approximately 0.510 inch maximum valve lift when installed at the recommended installed height.
Why upgrade valve springs on a 7.3L Power Stroke?
Upgraded valve springs help maintain proper valve control under increased boost, RPM, and cylinder pressure while reducing the risk of valve float in modified engines.
