fits model: 427, 396. make: Chevy. year: 1969.

( Manufacturer Part Number: 3919840 ), ( Part Type: Block Head Cylinder )
The 3919840 1969 Block 840 Big Heads Cylinder is a high-performance engine component designed for Chevrolet vehicles. This cylinder is specifically designed for 427 cubic inch engines and features a rectangular port for optimal fuel and air intake.
The Big Heads designation refers to the increased size of the combustion chambers, which allows for a larger volume of fuel-air mixture to be burned in each cycle, resulting in increased power and torque. The cylinder is made of cast iron, a material known for its strength and durability, ensuring reliable performance even under heavy loads.
The L-30-8 designation refers to the specific camshaft profile, which is designed to provide a balance of power and efficiency. The 30-8 refers to the duration of the intake and exhaust valve events, with 30 being the duration of the intake event in degrees after top dead center and 8 being the duration of the exhaust event in degrees before bottom dead center.
This cylinder is compatible with the 30-8 L camshaft, which is known for its ability to provide strong mid-range power and good low-end torque. The rectangular port design of this cylinder is also beneficial for improved fuel efficiency and reduced emissions, making it a great choice for performance enthusiasts who are looking to maximize power while also maintaining fuel economy.
Overall, the 3919840 1969 Block 840 Big Heads Cylinder is a high-quality, high-performance engine component that is designed to provide increased power and torque while also improving fuel efficiency and reducing emissions. It is a great choice for anyone looking to upgrade their 427 cubic inch Chevrolet engine and take their performance to the next level.
Pros of buying a 1969 Block 840 Big Heads Cylinder 427 30-8 L-30-8:1. Power: This engine is known for its powerful performance, as it has a displacement of 7.0 liters (427 cubic inches) and a 396 rectangle port design that allows for optimal airflow.
2. Durability: Chevy engines are known for their reliability and longevity, and this block 840 engine is no exception. It was designed to withstand heavy use and high horsepower.
3. Wide availability: This engine is a popular choice for classic car enthusiasts, so parts and resources are widely available.
Cons of buying a 1969 Block 840 Big Heads Cylinder 427 30-8 L-30-8:1. High cost: As a classic engine with a lot of power, this engine can be expensive to purchase and maintain.
2. Maintenance requirements: This engine requires regular maintenance, including oil changes, valve adjustments, and timing belt replacement, which can be costly.
3. Emissions regulations: This engine does not meet modern emissions standards, so it may not be legal to use in some areas.
Conclusion:The 1969 Block 840 Big Heads Cylinder 427 30-8 L-30-8 is a powerful and durable engine that is popular among classic car enthusiasts. While it can be expensive to purchase and maintain, it is widely available and offers excellent performance. However, due to emissions regulations, it may not be legal to use in all areas. If you are considering purchasing this engine, you should weigh the pros and cons and make sure it is a good fit for your needs and budget.
Recommendation:If you are looking for a powerful and reliable engine for your classic car, the 1969 Block 840 Big Heads Cylinder 427 30-8 L-30-8 is a great option. However, you should make sure to budget for regular maintenance and be aware of any emissions regulations in your area. You may also want to consider purchasing a rebuilt engine to ensure that it is in good condition and has been properly maintained. Overall, this engine is a great choice for classic car enthusiasts who value power, performance, and reliability.
And still has plenty of material for future milling. The flat side looks like its never been milled.
Everything looks great for a rebuild. These heads are very nice cores to build. No porting, polishing, repairs or stripped threads.
Very nice pair of number and date matching heads. Big block Chevy rectangle port cylinder heads l 30 8 cleaned and checked for cracks.