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ALL TEFLON type seals, sometimes known as "PC" seals for Perfect Circle, one of the first companies to start selling them. These actually fit positively over the valve guide and "wipe" the valve stems as they open and close. Because of the smaller outer diameter of these seals, they are the best choice for use with high performance dual and triple valve springs, however they require the outside of the valve guide to be machined down to either .500 or .530 (depending on which version of the seal used.) Stock type valves will use 3/8" stem size, while some aftermarket heads such as our STEALTH aluminum heads, will use 11/32" (slightly smaller) stem size to conserve weight. Sold in sets of 16. Use one set per engine. These are an UPGRADED type seal which will fit our Stealth heads.
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