Upgrade or replace your factory cylinder heads with these genuine OEM GM 243 aluminum cylinder heads, designed for GM LS-series Gen III / Gen IV engines. These sought-after 243 casting heads are commonly found on LS1, LS2, and LS6 engines and are a popular performance upgrade for 5.3L builds thanks to their improved airflow and combustion chamber design.
These heads come as complete assemblies with rocker arms, making them an excellent choice for engine rebuilds, swaps, or performance upgrades.
🔧 Item Details
Part Type: Cylinder Head Assembly
Casting: GM 243
Material: Aluminum
Condition: Used OEM
Configuration: Complete assemblies with rocker arms
Engine Compatibility: LS-Series Gen III / Gen IV
Quantity: Pair (Left & Right Cylinder Heads)
🚗 Compatible Engines
Commonly used with many GM LS-based engines, including:
These heads are frequently installed on Chevrolet, GMC, Pontiac, and Cadillac LS platforms when upgrading from lower-flow truck heads.
⭐ Key Features
Genuine GM OEM 243 casting heads
High-flow design ideal for performance builds
Aluminum construction for reduced weight and better heat dissipation
Includes rocker arms
Great for engine rebuilds, LS swaps, or performance upgrades
Compatible with Gen III and Gen IV LS engines
📦 Condition
Used OEM parts
Removed from a running engine
Normal signs of wear consistent with used automotive components
Please review photos carefully for cosmetic condition and included components
⚠️ Fitment Notice
Fitment may vary depending on engine model, year, and modifications. Please verify compatibility with your vehicle or engine build before purchasing.
🚚 Shipping & Handling
🛒 Why Buy OEM?
OEM parts provide factory-engineered fit, reliability, and performance, making them the preferred choice for professional technicians and enthusiasts alike.
If you have any questions about compatibility, LS swaps, or engine builds, feel free to message us before purchasing.
