Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Spring Pocket Vs Spring Size vs valve lenth Help Needed
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Old 05-30-2012, 07:14 AM
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You definitely need at a minimum a hardened shim to protect the aluminum head. I've used both the cup type and the I.D. locator type. Both work fine. In either case you need to verify the guide diameter to make sure it drops into place ok. As Cobalt said you also need to account for the thickness of the cup which in most cases is .06
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