Manley Performance Exhaust Valve - 12339-8

Brand: Manley Performance

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Part Number: 12339-8
Part Location: U.S.
Availability: *Special Order
Delivery: Up to 2 Weeks
If purchased before 12:00 EDT - estimated delivery by July 17

Retail: $480.89

Price: $457.99

You Save: $22.90

Color

Silver

Engine Compatibility

Chevy Big Block V8 396-502 Cubic Inch

Finish

Chrome Plated

Groove Type

Single

Head Diameter

1.85 Inch

Installed Height

0.1 Inch

Material

Stainless Steel

Quantity

Set Of 8

Stem Diameter

0.3415 Inch

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Manley Performance Exhaust Valve

Exhaust Valve; Severe Duty; For Use With Brodix 383 Head Hunter Cylinder Heads; 1.85 Inch Head Diameter; 0.3415 Inch Stem Diameter; 0.100 Inch Longer Installed Height; XH-432 Stainless Steel; Set Of 8

MPN: 123398

The Severe Duty® series of valves is the Manley signature in the performance and racing industry. Exhaust material XH-428 and intake material NK-844 is offered by no competitor in the world. And no pair of materials show such clear dominance over all others. Ultimate tensile strength of XH-428 at 1500 Degree Fahrenheit is nearly double the competitors’ EV-8. At 1000 Degree Fahrenheit the Manley NK-844 displays more than four times the ultimate tensile of the competition’s best intake material. Further proof of the superiority of the Manley Severe Duty® valves is evident in our comprehensive fatigue tests. In normal operation where valve float is non-existent, a valve will experience 20,000 to 25,000 Pounds of applied stress. However, when valves bounce on the seat the stress immediately soars to 40,000 to 60,000 Pounds. Manley exhaust valves (at 40,000 PSI and 1400 Degree Fahrenheit) ran to 100,000,000 (One Hundred Million) cycles while competitors’ offerings failed at 100,000 cycles. That’s 1000 times better fatigue life.

Engine Compatibility: Chevy Big Block V8 396-502 Cubic Inch

Head Diameter: 1.85 Inch

Stem Diameter: 0.3415 Inch

Installed Height: 0.1 Inch

Groove Type: Single

Finish: Chrome Plated

Color: Silver

Material: Stainless Steel

Quantity: Set Of 8

Features

Superior Stainless For High Temperature Gasoline Engines
Exhaust Material XH-428 With Double The Ultimate Tensile Strength (At 1500 Degree Fahrenheit) Over The Competition
Chrome Stems And Hard Tips
Swirl Polished And Fully Machined
Limited 90 Day Warranty

Specifications of Manley Performance Exhaust Valve - 12339-8
Color	Silver
Engine Compatibility	Chevy Big Block V8 396-502 Cubic Inch
Finish	Chrome Plated
Groove Type	Single
Head Diameter	1.85 Inch
Installed Height	0.1 Inch
Material	Stainless Steel
Quantity	Set Of 8
Stem Diameter	0.3415 Inch