GM 3908952 Port Cylinder Heads C-21-7/C-27-7

( Brand: Gm ), ( Manufacturer Part Number: 3908952 ), ( Type: Cylinder Head ), ( Oe/oem Part Number: Open Chamber Oval Port Chevy Truck 427 Heads 1967, 3928952 ), ( Material: Cast Iron ), ( Vintage Part: Yes )

Review GM Chevy Truck And 952 Oval Port Cylinder Heads C-21-7/c-27-7 fits MARINE 427 1967

Detailed Product Description for GM 3908952 1967 Chevy 427 Marine 952 Port Cylinder Heads (C-21-7/C-27-7)

Welcome to a comprehensive review of the GM 3908952 1967 Chevy 427 Marine 952 Port Cylinder Heads (C-21-7/C-27-7). These high-performance cylinder heads are a testament to General Motors' engineering excellence and are designed to deliver exceptional power and efficiency for your marine engine.

The 1967 Chevy 427 Marine 952 Port Cylinder Heads (C-21-7/C-27-7) are built with a robust construction, featuring a durable cast aluminum alloy that ensures longevity and resistance to corrosion, ideal for the demanding marine environment. The cylinder heads come with an impressive 21/27 intake and exhaust valve configuration, designed to optimize airflow and fuel efficiency, resulting in increased horsepower and torque.

These heads are equipped with large, high-flow C-21-7 intake and C-27-7 exhaust valves. The intake valves have a diameter of 2.20 inches, while the exhaust valves boast a diameter of 1.94 inches, providing ample capacity for high-performance marine applications. The valves are made from heat-resistant stainless steel to maintain their integrity under the extreme temperatures generated during operation.

The combustion chambers in these cylinder heads have been meticulously designed to provide optimal fuel-air mixture and a quick, efficient combustion process. The chamber shape and size have been optimized for the 427 cubic inch engine, ensuring optimal performance and fuel economy.

The GM 3908952 1967 Chevy 427 Marine 952 Port Cylinder Heads (C-21-7/C-27-7) also feature a high-quality, durable valve spring and retainer system. The dual valve springs provide excellent control over the valves during high RPM operation, reducing the likelihood of valve float and ensuring consistent performance.

In conclusion, the GM 3908952 1967 Chevy 427 Marine 952 Port Cylinder Heads (C-21-7/C-27-7) are a superior choice for those seeking high-performance marine engine components. Their robust construction, optimized airflow, and efficient combustion process make them an excellent investment for boat owners who demand the best from their marine engines. Upgrade your marine engine today with these top-quality cylinder heads and experience the difference in power and efficiency.

Analysis of Buying GM 3908952 1967 Chevy 427 Marine 952 Port Cylinder Heads (C-21-7/C-27-7)

1. High Performance: These cylinder heads are designed for high-performance applications, which can potentially deliver increased horsepower and torque.

2. Durable Construction: The cylinder heads are made from iron, known for its durability and resistance to heat. This can contribute to the longevity of the engine.

3. Designed for Marine Use: The 427 Marine heads are specifically designed for marine applications, which means they are designed to withstand the corrosive nature of saltwater and the constant vibration of a boat engine.

4. Availability of Parts: As these are aftermarket parts, replacement parts are likely to be readily available.

1. Compatibility: Ensure these heads are compatible with your specific engine and vehicle, as there may be differences between the marine and automotive versions.

2. Upgrade Cost: Installing these high-performance heads may require additional modifications to the engine and vehicle, which can increase the overall cost of the upgrade.

3. Expert Installation: Installing cylinder heads is a complex task that requires mechanical expertise. It is recommended to have a professional do the installation to ensure it is done correctly.

4. Potential Power Imbalance: If not properly balanced, these high-performance heads could potentially cause power imbalances in the engine, leading to performance issues or mechanical damage.

Conclusion: The GM 3908952 1967 Chevy 427 Marine 952 Port Cylinder Heads (C-21-7/C-27-7) offer high performance benefits for your engine, especially in marine applications. However, it's crucial to ensure compatibility with your specific engine and vehicle, and to have the installation done by a professional. The increased cost and potential for power imbalances should also be considered. If you're looking to significantly boost your engine's performance, these heads could be a good investment, but do thorough research and consult with a professional mechanic before making a decision.

Details:

The product is a vintage 1967 Chevy 427 truck and Marine cylinder heads with oval ports, specifically the OE/OEM part number 3928952 manufacturer 3908952.

part #: 3908952 prices

• $350.00-$799.00

specifications cylinderheapar:

• for models: Marine, 427
• for makes: Chevy
• brand: Gm
• mpn: 3908952
• type: Cylinder Head
• oe/oem part number: Open Chamber Oval Port Chevy Truck 427 Heads 1967, 3928952
• material: Cast Iron
• vintage part: Yes

offer cylinderheapar:

• availability: In Stock
• started: December 26, 2025
• options: Ship-to-home
• sold: 0
• quantity: 1

shipping cylinderheapar:

• cost: $250.00
• transit: 5-12 Days
• class: Economy
• service: Economy
• type: Fixed

payments cylinderheapar:

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

general cylinderheapar:

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

returns cylinderheapar:

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

seller cylinderheapar:

• city: Cincinnati, Ohio
• rating: 99.9%
• # reviews: 8340

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