KPMI Valve Spring Kit - .600 Lift HD Twin CAM — Harley-Davidson Electra Glide Classic, Sportster 883, Softail Heritage Classic (1984-2004)

KPMI valve spring kit for .600 lift Twin Cam engines, wound from premium Kobe Super-Clean Chrome Silicon wire and heat-treated, stress-relieved, and shot-peened for durability and performance. Engineered using advanced spring design simulation to match cam harmonics, stress, mass, and operating RPM for your specific application.

Features

• Premium Kobe Super-Clean Chrome Silicon wire
• Heat-treated and stress-relieved construction
• Shot-peened finish for fatigue resistance
• Engineered for .600 lift camshaft applications

Specifications

• Brand: KPMI
• Manufacturer Part #: 20-20122
• Length: 4.85 in
• Width: 8.65 in
• Height: 2.3 in
• Weight: 1.31 lbs

Frequently Asked Questions

What lift camshaft are these springs rated for?

These springs are engineered for .600 lift Twin Cam camshafts. Verify your cam lift before ordering.

Do I need new springs when upgrading my camshaft?

Yes — upgrading to a higher-lift cam requires matching valve springs to prevent coil bind and maintain proper valve control across the RPM range.

What's included in the kit?

The complete valve spring set with all springs needed for your Twin Cam engine application.