Product Description
CNC Fabrication 421011 94.5-03 7.3L Stage 2 Bee Hive Valve Spring Kit With Valve Seals
The CNC Fabrication 421011 Stage 2 Bee Hive Valve Spring Kit is a premium valvetrain upgrade designed for 1994.5-2003 Ford 7.3L Power Stroke diesel engines. Engineered for high-performance and high-horsepower applications, this kit features upgraded bee hive valve springs, new retainers, keepers, and valve seals to provide improved valve control and reliability under increased boost, RPM, and cylinder pressure.
Recommended for 7.3L Power Stroke engines producing over 500 horsepower, the CNC Fabrication Stage 2 kit offers significantly increased spring pressure compared to factory valve springs. Designed to support aggressive camshaft profiles and up to .600-inch valve lift, this kit helps reduce valve float and maintain valvetrain stability in demanding towing, racing, and performance applications.
Backed by CNC Fabrication's extensive experience with Ford Power Stroke engines, this kit delivers the durability, performance, and confidence serious diesel enthusiasts demand.
Features
- Designed for 1994.5-2003 Ford 7.3L Power Stroke engines
- Stage 2 bee hive valve spring upgrade
- Recommended for engines producing over 500 horsepower
- Includes new valve stem seals
- Includes new retainers and valve keepers
- Improved valve control under high boost and RPM conditions
- Helps reduce valve float
- Supports performance camshaft applications
- Designed for increased durability and reliability
- Built specifically for Ford Power Stroke performance engines
Fitment
- 1994.5 Ford F-Series 7.3L Power Stroke
- 1995 Ford F-Series 7.3L Power Stroke
- 1996 Ford F-Series 7.3L Power Stroke
- 1997 Ford F-Series 7.3L Power Stroke
- 1998 Ford F-Series 7.3L Power Stroke
- 1999 Ford F-Series 7.3L Power Stroke
- 2000 Ford F-Series 7.3L Power Stroke
- 2001 Ford F-Series 7.3L Power Stroke
- 2002 Ford F-Series 7.3L Power Stroke
- 2003 Ford F-Series 7.3L Power Stroke
Note: Professional installation is recommended. Valve spring installation may require specialty tools and should be performed according to proper engine assembly procedures.
What's Included
- Stage 2 Bee Hive Valve Springs
- Valve Stem Seals
- Valve Spring Retainers
- Valve Keepers
Specifications
- Manufacturer: CNC Fabrication
- Part Number: 421011
- Application: Performance Valve Spring Upgrade Kit
- Engine Compatibility: 1994.5-2003 Ford 7.3L Power Stroke
- Valve Spring Style: Bee Hive
- Kit Level: Stage 2
- Install Height: 1.880 Inch
- Seat Load: 155 lbs at 1.880 Inch
- Open Height: 1.280 Inch
- Open Load: 377 lbs
- Recommended Maximum Valve Lift: .600 Inch
- Spring Rate: 370 lbs/in
- Coil Bind Height: 1.210 Inch
- Includes Valve Seals: Yes
- Includes Retainers: Yes
- Includes Valve Keepers: Yes
- Recommended Power Level: 500+ Horsepower Applications
Cross Reference Numbers
421011, CNC421011, Stage 2 Bee Hive Valve Spring Kit, 7.3 Valve Spring Upgrade Kit, 7.3 Performance Valve Springs, 7.3L Valve Spring Kit With Seals
FAQ
Who should use the CNC Fabrication Stage 2 Valve Spring Kit?
This kit is recommended for 7.3L Power Stroke owners running performance upgrades, larger injectors, increased boost levels, aftermarket camshafts, or applications producing over 500 horsepower.
What is included with the kit?
The kit includes Stage 2 bee hive valve springs, valve stem seals, retainers, and valve keepers needed for installation.
Why upgrade valve springs on a 7.3L Power Stroke?
Upgraded valve springs help prevent valve float, improve valvetrain stability, and maintain proper valve control under higher RPM and boost conditions.
What valve lift can these springs support?
The CNC Fabrication 421011 Stage 2 kit is designed to support valve lifts up to .600 inch.
Can these springs be used on a stock engine?
Yes. While designed for performance applications, they can also be installed during engine rebuilds or preventative maintenance upgrades for added valvetrain control.
Do the valve seals come with the kit?
Yes. New valve stem seals are included along with retainers and keepers for a complete installation package.
