GSC P-D 21-4N Chrome Polished Intake Valve 36mm Head (+1mm) Single Subaru BRZ / Scion FR-S 2013| 2124-01

Product Fitment: 

2013 Subaru BRZ

2013 Scion FR-S

Designed specifically for the 2013 FA20-powered BRZ, and FR-S GSC Power-Division's intake valves set a new standard for performance and durability. Engineered using advanced 3D design and simulation software, these valves deliver superior airflow, reduced distortion, and industry-leading strength under high-stress conditions like high RPMs, boost, or aggressive cam profiles.

Every detail has been meticulously crafted—from swirl-polished heads to micro-polished stems—to ensure maximum flow, reliable sealing, and long-lasting valve train geometry.

Key Specs:

• Stem Diameter: 5.5mm

• Overall Length: 103.25mm

• Head Diameter: 36.00mm

Features:

• Swirl-Polished Heads: Enhances airflow for more power and efficiency

• Back-Cut for Reduced Mass: Supports higher RPM and boost without increasing spring pressure

• Micro-Polished Stems: Reduces drag, oil retention, and wear

• Modified 21-4N Stainless Steel: Exceptional high-temp strength and longevity

• Hardened or Stellite-Tipped Valve Ends: Extended life and compatibility with OEM or upgraded retainers

• Optimized Tip Height & Keeper Groove: Faster installation and better valve train geometry

• Works with OEM or Upgraded Locks: Although reuse of old locks is not recommended in performance applications

Why GSC Valves?

• Flow-bench tested for real-world gains

• Designed to seal better under heat and stress

• Engineered to outlast and outperform OEM and other aftermarket valves

• Perfect for N/A builds, high-boost setups, or aggressive cam profiles