{"product_id":"comp-cams-500-12-5-16-teflon-seal","title":"Comp Cams 5\/16 PTFE SEAL","description":"\u003cp\u003eCOMP Cams® offers a complete line of valve stem seals, from the stock GM \"O-Ring\" to the positive-stop PTFE seal. These seals are a must to keep unwanted oil from entering the combustion chamber through the clearance in the valve guides. The \"O-Ring\" seals use the standard retainer and oil splash shield. The umbrella seal is normally used when a larger-than-stock diameter spring is used, in the case of a double spring, the positive-stop PTFE seal is used. We also have a smaller diameter Viton seal available for triple spring applications. Both the O-Ring and the umbrella seals require no machining, but with the PTFE seal it is necessary to disassemble the heads and machine the top of the guide with a special .530\" diameter cutter. Whenever you are planning an engine overhaul or a cam change, don't forget the valve seals--COMP Cams® hasn't\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e","brand":"COMP Cams","offers":[{"title":"Default Title","offer_id":39899638268056,"sku":"04YF9","price":35.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0564\/0867\/0360\/files\/52d696760c882677bcb4bc461af00846.jpg?v=1744362711","url":"https:\/\/frsport.com\/products\/comp-cams-500-12-5-16-teflon-seal","provider":"FR SPORT","version":"1.0","type":"link"}