There are many different seals in the .530" size you will be machining to. One I like allot that allows decent stem oiling and seals well and fits the guide well is available from Summit racing and others. They are marketed by Comp Cams as part number 518-16. $17.97 a set. They are made by US seal in MI and repackaged by many manufacturers. You can buy direct from them with a $25.00 minimum order. Depends on how many you want.
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