Feuling Lifters - Race Series (4051 / 4018) — Harley-Davidson Softail Heritage Classic, Road King, Softail Fat Boy (1999-2025)

Feuling Race Series hydraulic lifters built from steel for high-lift cam applications and elevated valve spring pressures. Designed with a slower bleed-down rate to maintain oil flow, increase RPM capability, and reduce valve float on street and strip engines.

Features

• Steel body construction
• Slower bleed-down rate for sustained oil pressure
• Maintains top-end oil flow at high RPM
• Reduces valve float and promotes stability
• Spin-Tron dyno developed and track proven
• Made in the U.S.A.

Specifications

• Brand: Feuling
• Manufacturer Part #: 4018
• Length: 5 in
• Width: 6.2 in
• Height: 3.45 in
• Weight: 2.3 lbs

Fitment

Fits V-twin motorcycles. Recommended for engines running higher than 185 lbs. valve spring seat pressure and large-lift cam profiles.

Frequently Asked Questions

What's the difference between Race Series and standard Feuling lifters?

Race Series lifters have a slower bleed-down rate and are engineered for higher valve spring pressures and aggressive cam profiles beyond stock applications.

Do I need a high-volume oil pump with these lifters?

Feuling recommends a high-volume oil pump to keep these lifters quiet and performing at their best, especially on performance engines.

Are these compatible with Feuling oil pumps?

Yes — Race Series lifters work with both Feuling HP+ and Race Series oil pumps.

Will these help reduce valve float?

Yes. The slower bleed-down design and sustained oil pressure reduce valve float and improve valve-train stability at higher RPM.

Can I use these on a street bike?

Yes — Race Series lifters are designed for both street and strip engines, as long as your valve spring pressure and cam profile match Feuling's recommendations.