Manley Intake Valves for Chrysler, Dodge, Jeep and RAM with 6.2 Hellcat and 6.4 Hemi engines These valves can be used as a direct replacement (drop-in) in 6.2 L and 6.4 L-SRT and 6.4 L-BGE truck cylinder heads. They are an upgrade for supercharged engines and replace the standard hollow stem valves. These valves are used in engines with over 1500 hp. The Manley Race Master valves were specially developed to withstand the extreme loads on the race track. However, they are also ideal for modified road engines that are operated at speeds below 8000 rpm. The valves are made of XH-426 steel for the exhaust side and NK-842 material for the inlet valves - making them among the most robust valves in their class. Triple-groove valve stems for use with the standard valve wedges - plug & play without additional assembly work Material: The inlet valves are made of high-strength NK-842 stainless steel for maximum continuous performance and heat resistance Chrome-plated shaft Hardened valve tip Swirl-polished underhead areas and fully machined combustion surfaces to optimize gas flow and combustion efficiency Head diameter: 2.140 inches (≈ 54.36 mm) Shank diameter: 0.3125 inch (≈ 7.94 mm) Overall length: 5.135 inches (≈ 130.4 mm) - OEM height Valve tip length: 0.120 inch (≈ 3.05 mm) Underhead angle / radius: approx. 10° (Race Flo version) / approx. 3/8 inch (≈ 9.5 mm) Margin width: approx. 0.050 inch Seat width: approx. 0.080 inch Head shape: 5° Dish Delivery includes: 8 intake valves
