Product Description
Michigan Motorsports 1.590" Stainless High Performance LS Exhaust Valves
Fits 2007-Later 821, 823 & 5364 Rectangle Port Heads | Available Individually or as a Set of 8
Michigan Motorsports 1.590" stainless LS exhaust valves provide a performance-focused upgrade for compatible factory 821, 823, and 5364 rectangle-port cylinder heads. Manufactured from high-strength 21-4N stainless alloy, these one-piece forged valves feature hard chrome-plated stems and hardened tips for durability. Swirl polishing improves airflow compared with OEM GM valves and standard aftermarket replacements. Each valve is designed as a direct drop-in replacement for the factory 1.59" exhaust valve used in the listed LS3, L99, L76, L77, L92, LY6, L9H, L94, and L96 applications. Choose a single replacement valve or a complete set of eight.
Key Features & Benefits
- 21-4N Stainless Alloy: These exhaust valves are manufactured from high-strength 21-4N stainless alloy, providing an upgraded material for compatible factory LS cylinder heads. This construction makes them a performance-oriented alternative to the original exhaust valves and standard aftermarket replacements.
- One-Piece Forged Construction: Each valve uses a one-piece forged design developed for strength and durability. The forged construction gives LS engine builders an upgraded exhaust-valve option for compatible 821, 823, and 5364 rectangle-port cylinder-head castings.
- Hard Chrome-Plated Stems: Hard chrome plating is applied to the valve stems, while the valve tips are hardened for additional durability. These features support the valve at the guide and valvetrain contact areas during engine operation.
- Swirl-Polished for Improved Flow: Swirl polishing improves airflow compared with OEM GM valves and standard aftermarket replacements. This performance-focused design makes the valves a valuable upgrade for the compatible rectangle-port LS cylinder heads and engine codes listed below.
- Direct 1.590" Replacement Size: The valves are designed as direct drop-in replacements for the factory 1.59" exhaust valves used in the listed applications. Their specified fitment covers compatible LS3, L99, L76, L77, L92, LY6, L9H, L94, and L96 engines.
Purchase Options
- Single Exhaust Valve
- Set of 8 Exhaust Valves
Specs
- Brand: Michigan Motorsports
- Product Type: Exhaust Valve
- Valve Diameter: 1.590"
- Material: 21-4N Stainless Alloy
- Construction: One-Piece Forging
- Stem: Hard Chrome-Plated
- Tip: Hardened
- Valve Finish: Swirl-Polished
- Available Quantities: Single or Set of 8
Key Fitments
- Fits 2007-Later Rectangle Port Head Casting Numbers 821 823 5364
- Fits Engine Codes: LS3 L99 L76 L77 L92 LY6 L9H L94 L96
Product Videos
Custom Field
Product Reviews
2 Reviews Hide Reviews Show Reviews
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Good Upgrade
Their exhaust valves are a solid upgrade from the stock valves, if replacing anyway I'd call them a no-brainer. They weigh in at just under 90 grams on average for those that care.
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1.590" Stainless High Performance Exhaust
very nice.
