Product Description
CNC Fabrication 421007 94.5-03 7.3L Stage 1 Valve Spring Kit With Valve Seals
The CNC Fabrication 421007 Stage 1 Valve Spring Kit With Valve Seals is a performance valve train upgrade designed for 1994.5-2003 Ford 7.3L Power Stroke diesel engines. Engineered as an excellent upgrade over factory valve springs, this Stage 1 kit provides improved valve control and reliability for stock, towing, daily-driven, and mild performance applications up to approximately 500 horsepower.
Featuring increased spring pressures, premium valve seals, and carefully selected spring specifications, the CNC Fabrication 421007 helps maintain valve train stability under increased boost and RPM conditions. Whether you're rebuilding a cylinder head or upgrading your engine for improved durability, this kit offers a proven solution for 7.3L Power Stroke owners looking for dependable performance.
Features
- Designed for 1994.5-2003 Ford 7.3L Power Stroke engines
- Stage 1 performance valve spring upgrade
- Includes premium valve seals
- Improved valve control compared to factory springs
- Ideal for stock, towing, and mild performance builds
- Recommended for applications up to approximately 500 horsepower
- Helps reduce valve float at elevated RPM levels
- Excellent choice during cylinder head rebuilds
- Engineered specifically for the 7.3L Power Stroke platform
- Backed by CNC Fabrication's Ford Power Stroke expertise
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: This Stage 1 valve spring kit is intended for stock to mild performance applications. Proper installed height should be verified during installation. Always inspect valve train components for wear during assembly.
What's Included
- (16) CNC Fabrication Stage 1 Valve Springs
- (16) Valve Stem Seals
Specifications
- Manufacturer: CNC Fabrication
- Part Number: 421007
- Application: 7.3L Power Stroke Valve Train Upgrade
- Engine Compatibility: 1994.5-2003 Ford 7.3L Power Stroke
- Stage: Stage 1
- Valve Seal Included: Yes
- Spring Outside Diameter: 1.354 Inch
- Spring Inside Diameter: 0.940 Inch
- Seat Load: 119 lbs at 1.800 Inch
- Open Load: 312 lbs at 1.350 Inch
- Coil Bind Height: 1.280 Inch
- Spring Rate: 458 lbs/In
- Maximum Recommended Valve Lift: Approximately 0.510 Inch
- Quantity: 16 Springs Per Kit
- Recommended Power Level: Up to Approximately 500 HP
Cross Reference Numbers
421007, CNC421007, 7.3 Valve Spring Kit, 7.3L Stage 1 Valve Springs, 7.3 Power Stroke Valve Springs, 7.3 Valve Train Upgrade Kit
FAQ
What horsepower level is the CNC Fabrication 421007 designed for?
This Stage 1 valve spring kit is recommended for stock to mild performance 7.3L Power Stroke applications producing up to approximately 500 horsepower.
Does this kit include valve seals?
Yes. The CNC Fabrication 421007 includes a complete set of valve seals along with the valve springs.
How many valve springs are included?
The kit includes sixteen valve springs, enough for a complete 7.3L Power Stroke engine.
Why upgrade valve springs on a 7.3L Power Stroke?
Upgraded valve springs help improve valve control, reduce the potential for valve float, and support increased boost and engine speed compared to aging factory valve springs.
Is this kit suitable for towing applications?
Yes. The Stage 1 spring package is well suited for towing, daily driving, and mild performance applications where additional valve train stability is desired.
Can these springs be used during a cylinder head rebuild?
Absolutely. Many builders choose to install upgraded valve springs and new valve seals whenever cylinder heads are serviced or rebuilt.
