STK Performance Toyota Racing Single Valve Spring Kit 4AGE 20v + Retainers

Product Overview

High-performance single valve spring kit manufactured from premium Chrome Silicon. Engineered for reliable high-RPM operation and motorsport applications. Eliminates valve float and maintains precise valve timing under extreme conditions.

Engine Applications

Fits: AE101 / AE111 Corolla · Levin / Trueno

Engine codes: 4AGE 20v

What's Included

• 20 × Single Valve Springs
• 20 × Chromoly Retainers

Technical Specifications

Seating Pressure @ 34mm = 75lbs Full Lift Pressure = 135lbs

Material Specifications

Valve Springs: Premium Chrome Silicon (CrSi) - Shot peened and heat treated for superior fatigue resistance Retainers: 4130 Chromoly - Reduces inertia while ensuring long-term durability Performance Rating: 8500 RPM capability Lift Capacity: Up to 12mm camshaft lift

Application

Designed for naturally aspirated and turbocharged 4AGE 20v builds. Compatible with high-lift camshafts and performance builds.

Installation Notes

Professional installation recommended. Verify spring heights and valve travel to avoid coil bind.