1.66 X 4.980 X 45 Deg Ferrea Hi Performance Exh Valves (Set)  *For 1964-66 389-421 Heads* also 5C, 4x ,6x with stock size exhaust valves

Forging Process

In the production of our "one piece forging valve," the head of the valve is forged under a slow two-step process to avoid damage to the material structure. The forging piece is then machined entirely to eliminate any imperfection from the forging operation. Next is triple heat treatment, the stress-relief process, the grinding, and then the coating. Finally the valve stem is rolled to remove the rough scale and any gross imperfection on the surface. Ultrasonic tests and x-rays are then performed piece-by-piece to give each part a certified quality.

6000 Ultimate Race Series

The 6000 Series Competition Valves are designed to provide excellent reliability in an environment of high spring pressures and roller cams, at a budget price. They have higher fatigue resistance and tensile strengths than our competitor’s best offerings. These valves can be used in Drag and Oval Track racing applications.

To manufacture the valves we use our exclusive two-step slow forging process using EV8 stainless steel on both intake and exhaust valves.We provide a special heat-treatment and stress relieving process, along with hard chrome stems and friction-welded hard tips. We finish with a swirl polished head.

The valves feature flow improvements to deliver the power needed for today’s sophisticated racing engines. These valves are available for both the traditional Domestic performance and racing engine market and the Sport Compact performance and racing market.

5000 Performance Series

The 5000 Series Valves have become the alternative for performance engine builders that use our competitors “street” or “performance valve”. These valves are machined in our CNC centers allowing tight tolerances and cost effective design. They feature a one-piece forging made from stainless steel, a special heat treatment process, hard chrome stems, and hard tip.

Most applications are available in an undercut stem and dished head, while other applications are available in straight stem and flat head. These valves provide our customers with maximum value for their dollar, and are designed for Street Performance engines, mildly modified Drag and Oval Track applications.

These valves are available for both the traditional Domestic performance and racing engine market and the Sport Compact performance and racing market. Many of the 5000 series valves feature flat combustion chamber faces to help increase compression in naturally aspirated engines.

Titanium Series

Ferrea offers the finest titanium valve on the market. Our extensive R&D facility is constantly implementing new designs and processes, which continue to keep us in the forefront of engine valve technology. We manufacture each valve by forging a special high temperature titanium alloy with silicon.

This high-temp alloy is considered a “special upgrade” by our competitors; however, it has been the standard material in all of our exhaust and some intake valves for years. The valves then undergo an extensive heat treatment and stress-relieving process to ensure molecular integrity and prolong the valve’s life. Each Ferrea titanium valve is meticulously machined in our own precision CNC machining centers where it must pass extensive quality control procedures.

Our proprietary Chrome Nitride (CrN) coating sets the standard for valve manufacturers around the world. Our unique CrN coating is applied uniformly to the entire valve, forming a protective insulating barrier from high engine temperatures. Ferrea’s CrN coating provides rapid heat dissipation to the valve guide surface, friction reduction, wear resistance, hardness, and allows dynamic valve train forces and valve flex stresses without delaminating or flaking. All of our special processes provide maximum performance and reliability, affording longer life in today’s professional racing engines

Materials

Proper material choice for the application is crucial to the valve performance and reliability. The extreme change of temperature to a valve in the combustion chamber area (in excess of 1600F) and in the intake manifold area (up to -25F), can cause “thermal fatigue”. The material’s ability to resist these drastic thermal variations is crucial to the valve life. This is why Ferrea is constantly testing and evaluating new materials and processes to provide the highest level of “fatigue resistance” in the industry.