Product Overview
Complete high-performance valve train upgrade kit for Audi 1.8T 20v engines. Includes forged 21-4N Stainless Steel valves (inlet and exhaust), dual valve springs, and Chromoly retainers. Comprehensive solution for naturally aspirated and turbocharged applications.
Engine Applications
Fits: Golf Mk4 GTI · Audi A3 8L · Audi A4 B5 / B6 · Audi TT 8N · Seat Leon · Skoda Octavia · Passat B5
Engine codes
NA — ADR, APT, ARG, AGN, AFY, AVC, ARH
Turbo — AEB, AGU, AJH, AJL, AJQ, AMB, AMK, AMU, APH, APX, APY, AQX, AUM, AUQ, AWP, AWD, AWW, AWM, AWT, ARY, ARX, ARZ, AVJ, BAM, BEA, BEX, BFB, BJX, BBU, BKV, CFMA
What’s Included
Uprated Valve Springs 8 × Exhaust Dual Springs + 8 × Chromoly Retainers
Uprated Valve Springs 12 × Inlet SINGLE Springs + 12 × Chromoly Retainers
Forged Exhaust Valves 30x6x104mm × 8
Forged Inlet Valves 27x6x115mm × 12
Material Specifications
Forged Valves: 21-4N Stainless Steel – Temperature rating above 540°C, CNC machined
Valve Springs: Premium Chrome Silicon Steel – Dual spring design for optimal control
Retainers: 4130 Chromoly Steel – Reduced mass for improved valvetrain stability
Performance Rating: 8500 RPM capability
Lift Capacity: Up to 14mm camshaft lift
Application
Complete valve train upgrade for Audi 1.8T 20v engines. Ideal for high-performance naturally aspirated and turbocharged builds.
Installation Notes
Professional installation required. Verify all clearances and spring heights. Complete valve train system designed to work together.
