GENUINE GM PARTS 12641093 Engine Cylinder Head 195491210493

( Brand: Genuine Gm Parts ), ( Manufacturer Part Number: 12641093 ), ( Manufacturer Warranty: 1 Year ), ( Core Charge: 75.00 Which Is Included In The Total Price ), ( Type: Engine Cylinder Head Assembly ), ( UPC: 195491210493 )

Review GENUINE GM PARTS Engine Cylinder Head Assembly

The **GM 12641093 Engine Cylinder Head** is a precision-engineered component designed specifically for select General Motors small-block V8 engines, including those found in classic and modern applications such as the Chevrolet 350 and 400 cubic inch series, as well as the high-performance LS-series engines in certain configurations. Crafted from high-grade cast iron, this cylinder head is built to deliver exceptional durability, thermal efficiency, and performance, making it a critical part of the engine s combustion system. The head features a robust, compact design with integrated combustion chambers that optimize fuel-air mixture ignition and combustion efficiency, ensuring smoother operation and improved power output. Its compact shape allows for better airflow dynamics, reducing turbulence and enhancing cylinder scavenging, which is particularly beneficial for high-revving applications and forced induction setups.

The **GM 12641093** cylinder head incorporates a set of precision-machined valve seats and guides, engineered to accommodate either standard or aftermarket valve sizes, providing flexibility for performance upgrades. The valve springs and retainers are designed to handle high-stress conditions, reducing the risk of valve float at elevated RPMs, while the pushrod bores are strategically placed to minimize interference with other engine components. The head also features a robust valve cover mounting surface, ensuring a secure seal to prevent oil leaks and maintain proper lubrication within the valve train. For improved cooling and longevity, the head includes integrated water passages that evenly distribute coolant, preventing hot spots and thermal stress that can compromise performance or lead to premature wear.

This cylinder head is compatible with a range of fuel injection and carburetion systems, making it versatile for both stock and modified engine applications. Whether used in a classic muscle car restoration, a high-performance street rod, or a custom engine build, the **GM 12641093** delivers the reliability and performance expected from a GM small-block V8. Its robust construction, combined with the precision machining of the intake and exhaust ports, ensures optimal airflow and combustion, contributing to better throttle response, fuel economy, and overall engine efficiency. For enthusiasts seeking a balance of strength, durability, and performance, this cylinder head is an essential component for maintaining or enhancing the power potential of GM s legendary small-block engines.

**Pros and Cons of Buying a GM 12641093 Engine Cylinder Head**

The GM 12641093 cylinder head is commonly associated with engines like the GM LS-series (e.g., LS1, LS2, LS3) and is often used in performance applications. Below is a detailed breakdown of its advantages and disadvantages.

### **Pros**

1. **Compatibility and Availability**

The GM 12641093 cylinder head is widely used across various LS-series engines, making it easy to find replacements. It is also compatible with aftermarket modifications, including intake manifolds, exhaust headers, and performance camshafts.

2. **Performance Potential**

The head is designed for high-performance applications, featuring a large valve size (2.02" intake, 1.60" exhaust on some variants) and a high-flow design. This allows for significant power gains when paired with a high-flow intake, exhaust, and camshaft.

3. **Durability and Strength**

The casting is robust, and the head is built to handle high compression ratios and forced induction (turbocharging or supercharging) when properly supported. Many aftermarket upgrades (e.g., porting, polishing, or valve job) can further enhance airflow.

4. **Aftermarket Support**

There is extensive aftermarket support, including ported and polished heads, high-flow valves, and performance springs. Companies like JE, Comp Cams, and Edelbrock offer parts specifically designed to work with this head.

5. **Cost-Effective for Performance Builds**

Compared to some high-end performance heads, the GM 12641093 is relatively affordable, making it a cost-effective choice for enthusiasts looking to build a high-performance engine without breaking the bank.

6. **Easy to Modify**

The head is straightforward to work on, with accessible valve springs, retainers, and rocker arms. This makes it easier to perform maintenance, upgrades, or customizations.

7. **Widely Documented**

Due to its popularity, there is a wealth of online resources, forums (e.g., LS1-LS7, LSForums), and tutorials available for troubleshooting, installation, and modification.

---

### **Cons**

1. **Potential for Weakness Under Extreme Stress**

While the head is strong, it is not designed for extreme high-performance applications without reinforcement. Running excessive boost (especially without proper support like a reinforced block or high-flow fuel system) can lead to head gasket failure, warping, or even catastrophic failure.

2. **Head Gasket Issues**

The stock head gasket can be prone to failure, especially under high compression or forced induction. Aftermarket gaskets (e.g., Fel-Pro, ARP) are recommended for reliability.

3. **Valvetrain Wear Under Heavy Use**

The stock valvetrain (valves, springs, retainers) may wear out faster under aggressive camshafts or high RPM use. Upgrading to aftermarket components (e.g., Comp Cams, JE valves) is often necessary for longevity.

4. **Porting and Polishing Can Be Expensive**

While porting and polishing can significantly improve airflow, these services are not cheap. DIY porting is possible but requires skill and precision to avoid damaging the head.

5. **Threaded Holes for Studs Can Be a Weak Point**

Some versions of the head use threaded holes for cylinder head studs, which can strip under high torque or vibration. Using ARP or high-strength studs is recommended to prevent failure.

6. **Limited Stock Flow for Naturally Aspirated Engines**

While the head is strong, its stock flow characteristics may not be optimal for naturally aspirated engines without modifications. Porting or swapping in a high-flow head (e.g., LS3, LS7) can yield better results.

7. **Requires Proper Installation and Break-In**

Like any performance part, the head must be installed correctly and broken in properly to avoid issues like warping or valve float. Improper installation (e.g., overtightening, uneven torque) can lead to long-term problems.

---

### **Conclusion**

The GM 12641093 cylinder head is a versatile and widely used component that offers excellent performance potential for LS-series engines. It is well-suited for both stock and modified applications, provided the engine is properly supported with the right fueling, cooling, and valvetrain components. Its compatibility with aftermarket parts and ease of modification make it a favorite among enthusiasts.

However, it is not without limitations. Under extreme conditions (e.g., high boost without reinforcement), the head can fail if not properly upgraded or maintained. Potential buyers should ensure they are using high-quality gaskets, studs, and valvetrain components to maximize reliability.

For most performance builds especially those involving forced induction or aggressive camshafts the 12641093 head is a solid choice, but it requires careful planning and attention to detail.

---

### **Recommendation**

If you are building a **naturally aspirated** LS-series engine with moderate power goals (e.g., 400 500 hp), the stock or lightly ported 12641093 head can be a great starting point, especially if paired with a high-flow intake and exhaust.

- Use **ARP or high-strength studs** to prevent thread stripping.

- Install a **high-quality head gasket** (e.g., Fel-Pro 9000 or ARP).

- Upgrade the **valvetrain** with aftermarket springs, retainers, and valves (e.g., Comp Cams or JE parts).

- Ensure the **block and oil system** are reinforced for high RPM and boost.

- Consider **porting and polishing** if aiming for maximum airflow.

If your budget allows, a **swapped or ported LS3/LS7 head** may offer better stock flow for naturally aspirated builds, but the 12641093 remains a cost-effective and capable choice for many applications.

**Final Verdict:** Buy the GM 12641093 cylinder head if you are confident in your ability to support it with proper modifications and maintenance. For high-end builds, pair it with the best aftermarket components to avoid failure.

Details:

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This part fits vehicles made in the following years 2008 ,2009,2010,2011,2012. See below for instructions. High-value items are usually sent with signature-delivery requirements. Changed My Mind.

12641093: Genuine GM Parts: Engine Cylinder Head Assembly. If you do, our experts will hand-verify compatibility before shipping. Just Didn't Like it.

part #: 12641093 prices

• $1095.95-$1180.03

specifications cylinderheapar:

• brand: Genuine Gm Parts
• mpn: 12641093
• manufacturer warranty: 1 Year
• core charge: 75.00 Which Is Included In The Total Price
• type: Engine Cylinder Head Assembly
• upc: 195491210493

payments cylinderheapar:

• other
• wallet: Apple-pay
• credit card: Discover

seller cylinderheapar:

• rating: 99.2%
• city: Garland, Texas
• # reviews: 19119

returns cylinderheapar:

• time: 30 Days
• paid by: Seller
• policy: Returns Accepted

offer cylinderheapar:

• started: May 16, 2026
• options: Ship-to-home
• availability: In Stock
• sold: 0
• quantity: 5

shipping cylinderheapar:

• cost: $0.00
• class: Standard
• service: Standard
• type: Fixed
• transit: 15-22 Days

general cylinderheapar:

• Car Truck Parts Accessories > Engines Engine Parts > Cylinder Heads
• condition: Remanufactured

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