Manley Performance

Manley Chevrolet LS1intake Valve Kit - 2.100in Head Dia. 4.874in O/A Length, 0.3133in Stem

SKU 11684H-8Sold out
$694.19$925.59Save $231.40

  • Ships fast from US warehouses
  • Local pickup available
  • Professional install & dyno tuning in-house

Manley Chevrolet LS1intake Valve Kit - 2.100in Head Dia. 4.874in O/A Length, 0.3133in Stem

Manley Severe Duty® Valves deliver the ultimate in strength, reliability, and high-performance durability. Engineered for extreme gasoline engine temperatures, these valves are crafted from exclusive materials (XH-428 for exhaust and NK-844 for intake), offering unmatched tensile strength compared to competitive alloys. In fatigue testing at 40,000 psi and 1400°F, Manley exhaust valves endured 100 million cycles, while competitors failed after just 100,000, proving a 1,000× longer fatigue life. Each valve features chrome stems, hard tips, and swirl-polished underheads with fully machined combustion faces for superior airflow, efficiency, and wear resistance. Built for those who demand race-winning strength and precision, Manley Severe Duty® Valves set the industry standard for performance and endurance.

Fitment

Manley Valve - Intake, Valve-LS1 P/F 2.100 HOLLOW.

Specifications

Manufacturer part number
11684H-8
UPC
807298069739
Shipping weight & size
4.00 lb, 11.75 × 6.75 × 2.5 in

Notices

  • WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
  • Special order item — ships direct from the manufacturer; extended lead times may apply.