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Valve sizes are 1.53 in (39 mm) diameter inlet and 1.325 in (33.7 mm) diameter exhaust on all engines except the later "Big Valve" engines. The valve stem axis is inclined 27° from vertical on both intake and exhaust.
The original Schrader valve design was invented in 1891, and patented in the United States in 1893. [2] The Schrader valve consists of a valve stem into which a valve core is threaded. The valve core is a poppet valve assisted by a spring. A small rubber seal located on the core keeps the fluid from escaping through the threads.
A gap of 0.4–0.6 mm (0.016–0.024 in) is present around the valve stem, therefore a valve stem oil seal is used to prevent oil being drawn into the intake manifold and combustion chamber. Typically, a rubber lip-type seal is used.
In the 1980s, many U.S. production engine remanufacturers began reaming valve guides, rather than replacing them, as part of their remanufacturing process. They found that by reaming all the valve guides in a head to one standard size (typically 0.008 in. diametrically oversized), and installing remanufactured engine valves having stems that are also oversized, a typical engine head can be ...
Stem Diameter: Intake 0.2729-0.2739 in. (6.931-6.957 mm) ... (Closed Valve) Intake ... Wire Diameter: Intake 0.1878 x 0.1496 in. (4.77 x 3.80 mm) ...
A valve stem is a self-contained valve that opens to admit gas to a chamber (such as air to inflate a tire), [1] and is then automatically closed and kept sealed by the pressure in the chamber, or a spring, [2] [3] or both, to prevent the gas from escaping.