Manley 12354-8 Severe Duty Pro Flo Intake Valves LS3 L99 2.165 8mm

The Manley 12354-8 Severe Duty Pro Flo intake valves are engineered for LS3, L99, and L92 cylinder head applications, delivering exceptional performance for bracket racing, oval track, and high-performance street engines. These valves feature a 2.165-inch head diameter with an 8mm (0.3133-inch) stem diameter and are 0.300 inches longer than stock, with an overall length of 5.200 inches.

Key Features:

• Constructed from NK-844 stainless steel intake material with superior tensile strength
• Chrome stems and hardened valve tips for maximum durability
• Swirl polished and fully machined for optimal airflow
• Pro Flo 12-degree underhead angle for enhanced flow characteristics
• OE-style radius keeper grooves for reliable valve train operation
• NK-844 material exhibits exceptional resistance to chordal fractures

Manley's Severe Duty series represents the pinnacle of performance valve technology, with NK-844 material displaying over four times the ultimate tensile strength of competing intake materials at 1000°F. Each valve weighs approximately 120 grams and features a 0.100-inch seat width for proper sealing.