GSC Power Division 2062-12 21-4N Intake Valves STD for Toyota 2JZ-GE/GTE Supra

Vehicle Fitment

• 1993-1998 Toyota Supra (2JZ-GTE Twin Turbo, RWD)
• 1993-1998 Toyota Supra (2JZ-GE Naturally Aspirated, RWD)
• 1993-2005 Lexus GS300 (2JZ-GE, RWD)
• 1992-2000 Lexus SC300 (2JZ-GE, RWD)
• 2001-2005 Lexus IS300 (2JZ-GE, RWD)
• 2001-2005 Lexus IS300 SportCross (2JZ-GE, RWD)

Fitment Notes

• Fits both the 2JZ-GTE (twin turbocharged) and 2JZ-GE (naturally aspirated) variants - the intake valve specifications are shared across both engine configurations
• Standard (STD) 33.50mm head diameter - confirm existing valve seat diameter before installation; only use with heads that have not been previously cut for oversized valve seats
• For heads machined to accept oversized seats, use GSC part number 2064-12 (+1mm, 34.50mm intake valves)
• Sold as a set of 12 - one complete engine set for the inline-6 (2 intake valves per cylinder x 6 cylinders)

Features

• Modified 21-4N stainless steel alloy construction provides excellent strength, heat resistance, and long-term durability in both naturally aspirated and turbocharged 2JZ applications
• Micro polished valve stems minimize oil retention and reduce drag against the valve guide, ensuring smooth, consistent motion throughout the full RPM range
• Swirl polished valve heads optimize airflow across the valve face for improved intake charge flow, supporting combustion efficiency and peak power output
• Back-cut head design reduces valve mass, enabling higher RPM operation, increased boost pressure tolerance on the 2JZ-GTE, and compatibility with more aggressive camshaft profiles without raising valve spring seat pressures
• Maximized under-head dish removes additional valve weight while maintaining full structural integrity under sustained high-temperature operating conditions
• Precision-adjusted valve tip lengths minimize tipping requirements during installation, maintaining proper valvetrain geometry and reducing valve lash setup time
• Engineered keeper groove geometry balances intake and exhaust spring pressures across the valvetrain, reducing reliance on valve spring shims and optimizing performance from GSC spring and retainer kits
• Valve tips hardened or stellite-tipped to within 5 Rockwell C of the rocker or tappet contact surface, minimizing tip wear over the full service life of the valve
• Less face distortion under extreme conditions than competing tested designs, enabling superior sealing and more consistent performance throughout the life of the valve
• Designed, machined, and flow tested in-house on CNC machining centers using advanced 3D FEA and flow simulation software validated in the specific 2JZ application

Specifications

• Position: Intake (set of 12 - complete engine set for inline-6)
• Valve Head Diameter: 33.50mm (STD / Standard Size)
• Valve Stem Diameter: 6.0mm
• Overall Valve Length: 98.40mm
• Material: Modified 21-4N stainless steel
• Stem Finish: Micro polished
• Head Finish: Swirl polished with back cut; maximized under-head dish
• Application Engine: Toyota 2JZ-GE / 2JZ-GTE (3.0L DOHC I6, naturally aspirated and twin turbocharged)
• Quantity per Set: 12

Included Components

• 12x GSC Power Division 21-4N STD Intake Valves (33.50mm head, 6.0mm stem, 98.40mm length)

Product Description

The GSC Power Division 2062-12 is a complete set of twelve standard-size (33.50mm) 21-4N stainless intake valves for the Toyota 2JZ-GE and 2JZ-GTE engines - covering the 1993-1998 Toyota Supra (both naturally aspirated and twin turbocharged variants), the 1993-2005 Lexus GS300, the 1992-2000 Lexus SC300, and the 2001-2005 Lexus IS300 and IS300 SportCross. The 2JZ family is a 3.0L DOHC inline-6 with 24 valves total (12 intake, 12 exhaust), and this set supplies the complete intake side for a full head rebuild. Built from a modified 21-4N stainless steel alloy, these valves deliver a meaningful performance and durability upgrade over stock components in both street and track-driven builds.

GSC engineered the 2062-12 with a focus on improved flow, reduced valve mass, and long service life. The swirl polished and back-cut heads improve intake charge flow into the combustion chamber, while the micro polished stems reduce friction and oil accumulation against the guide for smoother valve motion across all RPM ranges. The precision-adjusted tip lengths reduce the amount of tipping needed during installation, and the engineered keeper groove geometry minimizes spring shim requirements - both of which translate to a more efficient and accurate head assembly on the 2JZ's closely spaced valvetrain. Less valve face distortion under sustained heat and pressure further ensures consistent sealing performance over the life of the part.

Sold as a set of 12 - exactly one per intake port across all six cylinders - the GSC 2062-12 is a direct-fit replacement for heads with standard (uncut) 33.50mm intake valve seats. For heads that have been machined for oversized seats, GSC part number 2064-12 (+1mm, 34.50mm) is the correct choice. For a complete valvetrain rebuild, GSC recommends pairing these intake valves with the matching STD exhaust valves (GSC2061-12), Manganese Bronze intake valve guides (GSC3032), and Viton valve stem seals (GSC1030). The 2062-12 is equally well-suited for high-power 2JZ-GTE builds running aftermarket turbos and cams as it is for naturally aspirated GE builds seeking reliable, high-quality replacement valves.