fits model: Corvair, Boss.

( Manufacturer Part Number: 3878565 ), ( Part Type: Head )
The 3878565 140 Corvair Boss Big Nose Heads are a high-performance upgrade for your Corvair engine. These cylinder heads are designed to provide increased power and improved engine efficiency.
The 140 Corvair Boss Big Nose Heads feature a larger intake port and valve diameter, which allows for more air and fuel to enter the combustion chamber. This results in a larger combustion volume, which in turn produces more power. The heads also have a larger valve angle, which improves the flow of air and fuel, further enhancing engine performance.
The 3878565 140 Corvair Boss Big Nose Heads are made from high-quality aluminum alloy, which is lightweight yet strong. This makes the heads durable and able to withstand the high temperatures and pressures of high-performance engines. The heads also have a polished finish, which not only looks great but also helps to reduce engine heat and improve performance.
The 140 Corvair Boss Big Nose Heads are designed to fit directly onto your Corvair engine, making installation easy and straightforward. The heads come with new valves, springs, and retainers, which are all of high quality and designed to provide reliable performance.
In summary, the 3878565 140 Corvair Boss Big Nose Heads are a high-performance upgrade for your Corvair engine. They feature a larger intake port and valve diameter, a larger valve angle, and are made from high-quality aluminum alloy. The heads are easy to install and come with new valves, springs, and retainers. If you're looking to improve the performance of your Corvair engine, these heads are a great option to consider.
Pros of buying 3878565 140 Corvair Boss Big Nose Heads:1. Power: The Big Nose heads are known for their increased power output compared to the standard Corvair heads. They offer improved combustion efficiency and larger valve sizes, which can lead to more horsepower and torque.
2. Compatibility: These heads are designed to fit Corvair engines, making them a convenient option for owners looking to upgrade their engines without extensive modifications.
3. Availability: As aftermarket parts, 3878565 140 Corvair Boss Big Nose Heads are widely available from various online retailers and performance parts stores, making them easy to purchase.
Cons of buying 3878565 140 Corvair Boss Big Nose Heads:1. Cost: Upgrading to Big Nose heads can be expensive, as they often require additional modifications such as new valve springs, camshaft, and intake manifold.
2. Fitting and Installation: Installing Big Nose heads can be a challenging process, especially for those without mechanical experience. It may require the assistance of a professional mechanic or engine builder.
3. Performance Gains: While the Big Nose heads can provide increased power, they may not offer the same level of improvement as other engine upgrades, such as a larger displacement engine or a turbocharger.
Conclusion:The 3878565 140 Corvair Boss Big Nose Heads offer a convenient and powerful upgrade option for Corvair engines. However, the cost and installation complexity should be carefully considered before making a purchase. If you're looking for a noticeable power boost and are comfortable with the added expense and work involved, then these heads may be a good choice for you. If you're on a tight budget or prefer a more straightforward upgrade, you may want to consider other options.
Recommendation:If you decide to purchase 3878565 140 Corvair Boss Big Nose Heads, we recommend researching and comparing prices from various retailers to ensure you're getting a fair deal. Additionally, consider consulting with a professional mechanic or engine builder to ensure proper installation and ensure that the upgrade will provide the desired performance gains.
Just imagine owning a pair of new hard to find heads with zero heat cycles. These are the hard to find big Boss top cover holes, desired for the A/C compressor bracket. Up for offer is a pair of nos 140 heads.
Comes with nos valves, springs, retainers, keepers, shims, rocker arms, carb studs, balance tubes, and block offs. No machining of the head gasket surface's and dealing with high compression's, or re welded patched up heads from the 60's.
They will come in there original boxes, and even include the staples.