For performance use. Genuine Manley 8mm stem stainless steel valves with hard tips for intake and/or exhaust applications. These valves have hard chrome stems. When used with high ratio rockers with the adjusting screw on the pushrod end, you should still use GB 369 or GB 369T lash caps. Use with GB 341 swivel screws with stock rocker arms that have the adjusting screw on the valve stem end. All of our stainless steel valves are swirl polished. Play safe and get the best. SW 3# set of 4.
Note: When 42mm or larger valves are used in a factory head, it is mandatory to relocate the spark plug hole. If not done the seat can be distorted when you tighten the spark plug, causing valve leakage. See LABOR (head) section.