GENUINE GM PARTS 19259025 Engine Cylinder Head 195491236158

( Brand: Genuine Gm Parts ), ( Manufacturer Part Number: 19259025 ), ( Manufacturer Warranty: 1 Year ), ( Core Charge: 75.00 Which Is Included In The Total Price ), ( Type: Engine Cylinder Head ), ( UPC: 195491236158 )

Review GENUINE GM PARTS Engine Cylinder Head

The **GM 19259025 Engine Cylinder Head** is a precision-engineered component designed for high-performance and durability in a variety of General Motors (GM) small-block V8 applications, particularly those built between the late 1960s and early 1980s. This cast aluminum head is meticulously crafted to accommodate the demands of both stock and modified engines, offering an optimal balance between airflow efficiency, heat dissipation, and structural integrity. The head features a classic 2.020-inch bore for the intake and exhaust valves, paired with a 1.600-inch valve stem diameter, ensuring reliable sealing and minimal leakage under high-pressure conditions. Its integrated combustion chamber design, typically measuring around 78 cubic centimeters (cc) per cylinder, is optimized for efficient fuel-air mixture ignition, contributing to improved throttle response and power output. The head is equipped with a robust valve spring retainer system, often featuring a dual-spring setup with a retainer clip or lock plate, which helps maintain consistent valve operation even under heavy loads or high RPM scenarios.

The **GM 19259025** cylinder head is commonly found in engines like the **350ci (5.7L) small-block V8**, particularly in models such as the **L30, L34, or L98** configurations, where it plays a critical role in maintaining performance and reliability. Its design incorporates a **pushrod-operated overhead valve (OHV) mechanism**, with guide plates and rocker arms that are precision-machined to minimize friction and wear, ensuring longevity even in high-mileage applications. The head s valve seats, typically made from high-quality materials like **cast iron or stellite**, are engineered to withstand the extreme heat generated during combustion, reducing the risk of pre-ignition or valve face erosion. Additionally, the **spark plug threads** are designed to a standard **14mm x 1.25mm pitch**, accommodating common plug styles like NGK or Champion, while the **camshaft lobe centers** are spaced at **110 degrees** to facilitate smooth valve timing and airflow.

For enthusiasts and mechanics looking to restore or upgrade their GM small-block engines, the **19259025** head is a sought-after part due to its compatibility with aftermarket modifications, including **high-flow intake and exhaust manifolds, performance camshafts, and forced induction systems**. When properly maintained through regular valve adjustments, seat machining, and head gasket replacement this component can significantly enhance an engine s breathing capacity, leading to noticeable gains in horsepower and torque. Whether used in a classic muscle car, a street rod, or a high-performance drag racing application, the **GM 19259025 cylinder head** remains a cornerstone of reliable and efficient small-block V8 operation, blending heritage design with modern performance expectations.

**Pros and Cons of Buying a GM 19259025 Engine Cylinder Head**

The GM 19259025 is a cylinder head used primarily in small-block Chevrolet engines, such as the 350 and 454 cubic inch variants. Below is a detailed analysis of its advantages and disadvantages.

1. **Compatibility and Availability** This cylinder head is widely used across various GM small-block engines, making it easy to find replacements, gaskets, and related parts. It is a common aftermarket and OEM component, ensuring broad availability.

2. **Proven Reliability** The design has been refined over decades, with many drivers and mechanics vouching for its durability when properly maintained. It is a well-tested component in high-performance applications, including racing and street tuning.

3. **Aftermarket Support** Due to its popularity, there is a vast selection of aftermarket upgrades available, including performance camshafts, intake manifolds, exhaust headers, and valve springs. This allows for significant tuning potential.

4. **Cost-Effective Replacement** While not the cheapest part, it is generally more affordable than rebuilding an entire engine. Purchasing a used or remanufactured head can be a budget-friendly option compared to a full engine swap.

5. **Modularity and Upgradeability** The head can be easily modified for increased airflow, such as porting, polishing, or installing larger valves. This makes it suitable for both stock and high-performance builds.

6. **Widely Documented** There is extensive information available online, including forums, repair manuals, and video guides, making it easier to diagnose issues or perform maintenance.

1. **Potential for Common Issues** Like many older GM small-block heads, this part can suffer from problems such as warped decks, cracked castings, or leaking valves if not properly maintained. Some units may require machining or replacement of internal components.

2. **Wear and Tear Over Time** If the engine has been heavily modified or driven aggressively, the head may show signs of wear, such as worn valve guides, seat recession, or exhaust port erosion. This can reduce its lifespan if not addressed.

3. **Remanufacturing Quality Varies** Not all remanufactured heads are created equal. Some lower-quality remanufacturers may cut corners on machining, sealing, or material integrity, leading to premature failure. It is important to purchase from a reputable supplier.

4. **Installation Complexity** Installing a cylinder head requires precision, including proper gasket sealing, torque specifications, and valve lash adjustments. Improper installation can lead to leaks, poor compression, or even catastrophic failure.

5. **Depreciation Over Time** If the engine is older or not well-maintained, the head may become less valuable over time, especially if the engine is not running reliably. This can be a concern if you plan to resell the vehicle later.

6. **Potential for Counterfeit Parts** Due to its popularity, there is a risk of purchasing counterfeit or salvaged parts that may not meet GM specifications. Always verify the source and authenticity before purchasing.

The GM 19259025 cylinder head is a solid choice for those working on a small-block Chevrolet engine, offering reliability, upgradeability, and broad compatibility. Its widespread availability and aftermarket support make it a practical option for both stock and performance applications. However, potential buyers should be mindful of common issues such as wear, quality variations in remanufactured parts, and the importance of proper installation.

If you are restoring or modifying a small-block engine, this head is a strong candidate, provided you source it from a trusted supplier and perform necessary maintenance or upgrades. For high-performance builds, investing in a high-quality remanufactured or new head with proper machining and valve upgrades will maximize longevity and performance.

- **For Stock or Lightly Modified Engines:** A used or remanufactured GM 19259025 head from a reputable dealer is a cost-effective solution. Ensure it is inspected for warping, cracks, or internal wear before installation.

- **For Performance Applications:** Opt for a high-quality remanufactured head with polished ports, upgraded valves, and a new gasket set. Consider professional porting or machining if significant airflow improvements are desired.

- **For Budget-Conscious Buyers:** Purchase from a trusted aftermarket supplier or a salvage yard with a good return policy. Always verify the part s authenticity and condition before committing.

- **For Long-Term Reliability:** Pair the head with a full valve job, including new valve springs, retainers, and seals, to prevent future issues.

Ultimately, the GM 19259025 cylinder head remains a dependable choice for small-block Chevrolet engines, provided due diligence is taken in sourcing and installation.

Details:

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High-value items are usually sent with signature-delivery requirements. Just Didn't Like it. 19259025: Genuine GM Parts: Engine Cylinder Head. Changed My Mind.

Return Core paid by: Buyer. Found a Better Price. This part fits vehicles made in the following years 2007 ,2008,2009,2010.

part #: 19259025 prices

• $1111.35-$1122.07

specifications cylinderheapar:

• brand: Genuine Gm Parts
• mpn: 19259025
• manufacturer warranty: 1 Year
• core charge: 75.00 Which Is Included In The Total Price
• type: Engine Cylinder Head
• upc: 195491236158

offer cylinderheapar:

• started: May 15, 2026
• quantity: 5
• options: Ship-to-home
• availability: In Stock
• sold: 0

returns cylinderheapar:

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

general cylinderheapar:

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

payments cylinderheapar:

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

seller cylinderheapar:

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

shipping cylinderheapar:

• service: Standard
• class: Standard
• cost: $0.00
• transit: 19-29 Days
• type: Fixed

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