Manley 12850H-8 Severe Duty Hollow Stem Intake Valves Big Block Chevy 2.250"

The Manley 12850H-8 Severe Duty intake valves are engineered for high-performance and racing applications in Big Block Chevrolet engines. These valves feature an advanced hollow stem design that reduces reciprocating weight while maintaining exceptional strength and durability.

Key Features:

• NK-844 stainless steel construction with 1000 times better fatigue strength than competitors
• Hollow stem design for reduced weight and improved performance
• 2.250 inch head diameter with .3110 inch stem diameter
• 5.344 inch overall length (.100 inch longer than stock)
• Chrome stems with hardened valve tips for extended service life
• Fully machined and swirl polished for optimal surface finish
• 10 degree x 3/8 inch underhead angle and radius

Important Note: These .311 inch stem valves are ONLY compatible with Bead Loc® keeper grooves. Bead Loc® valve locks are required for proper installation.

Manley's Severe Duty series represents the pinnacle of valve technology, offering materials and engineering unmatched in the industry. The NK-844 intake material provides superior tensile strength at high temperatures, making these valves ideal for bracket racing, oval track, and high-performance street engines.