FED Dual Conical .700 Lift Valve Spring Kit

NEW FED Dual Conical .700 Spring Kit

The NEW FED Dual Conical .700 Spring Kit is the go-to choice for LS aftermarket performance engines. Designed for high-RPM naturally aspirated and boosted applications, this spring kit delivers improved valve-train stability, reduced mass, and increased RPM capability.

While some may say a valve spring is simply a valve spring, performance comes down to what the spring can do for your application. At FED, our formula is simple: lighter mass, non-interference, increased valve-train stability, and more RPM.

Featuring an ovate conical design, the FED Dual Conical spring uses a smaller-diameter retainer that is approximately 5 grams lighter than our standard FED .700 dual spring. The non-interference design also reduces spring-to-spring contact, minimizing heat generated by rubbing friction. This helps promote longer spring life and improved durability in demanding applications.

The spring kit is available for both stock valve guides (.505") and bronze valve guides (.565").

Each kit includes:

• High-grade titanium retainers
• Black oxide steel locators
• 7mm GM valve locks
• Drop-in fitment for stock and aftermarket cylinder heads

Whether you're building a high-RPM naturally aspirated combination or a serious, boosted LS engine, the FED Dual Conical .700 Spring Kit is engineered to provide the stability, durability, and RPM capability your valve train demands.

Kit includes:

FED Dual Conical .700 dual spring (16)

GM LS locks (32)

Titanium retainers (16)

Locators for stock or bronze guides (16)

Viton High Heat Valve Seals (16)

Spring specs:

Max Valve Lift: .700" 

Installed Height: 1.800"

Seat Pressure: 179 lbs @ 1.800"

Open Pressure: 490 lbs @ 1.100"

Spring Rate: 444 lbs/in

Coil Bind Height: .975”

Outer O.D.: 1.153" Top of spring

Outer O.D.: 1.315" Bottom of spring