Manley 12347-8 Severe Duty Exhaust Valves for Chevy LT1 6.2L

Manley 12347-8 Severe Duty exhaust valves are engineered specifically for 2014+ Chevrolet LT1 6.2L engines, delivering exceptional performance and durability for bracket racing, oval track, and high-performance street applications. These premium exhaust valves feature a 1.590-inch head diameter with a 0.3136-inch (8mm) stem diameter at stock installed height.

Premium Construction and Materials:

• Manufactured from proprietary XH-428 stainless steel alloy for superior high-temperature performance
• Chrome stems with hardened valve tips for enhanced wear resistance
• Swirl polished underhead areas and fully machined combustion faces
• Overall length of 5.205 inches with 0.160-inch tip length
• 25-degree underhead angle with 0.100-inch valve seat width

Manley's Severe Duty series represents the company's signature achievement in performance and racing valve manufacturing. The exclusive XH-428 exhaust valve material offers nearly double the ultimate tensile strength at 1500°F compared to competitor materials, with proven endurance of up to 100 million cycles under extreme testing conditions. These valves are designed for engines operating below 8000 RPM and feature OEM-style radius keeper grooves for reliable installation.