Manley 11577-8 Severe Duty Exhaust Valve Small Block Chevy 5.165" Length

The Manley 11577-8 Severe Duty exhaust valve is engineered for high-performance Small Block Chevrolet applications, delivering exceptional durability and reliability under extreme operating conditions. This valve represents the pinnacle of performance engineering for bracket racing, oval track, and high-performance street engines.

Premium XH-428 Stainless Steel Construction:

• Manufactured from XH-428 stainless steel material with nearly double the ultimate tensile strength of competitor materials at 1500°F
• Chrome stem and hardened valve tip for superior wear resistance
• Swirl polished and fully machined for optimal performance
• OE-style radius keeper grooves for reliable retention

Proven Durability:

• Successfully tested at 40,000 psi and 1400°F, enduring up to 100 million cycles
• Delivers 1000 times better fatigue life compared to competitors' offerings
• Designed specifically for high-temperature gasoline engine applications
• 5.165" overall length provides precise geometry for Small Block Chevy engines

Manley's Severe Duty valve series is trusted by professional engine builders and enthusiasts who demand uncompromising quality and performance. Each valve undergoes rigorous testing to ensure it can withstand the extreme stresses of high-performance engine operation, including valve bounce conditions that can generate up to 60,000 lbs of stress.