The past repair for weak spring tension on head refurb was shims under the spring to restore seat pressure however wont this just aggravate our problems of collapsing lifters if running the stock oil pump? High spring seat pressures are only required with aggressive cams or high rpm. Driving the Packard conservatively should not create an issue, Is there a vin break point or build date to ensure hardened retainers. I assume the file test is on a torn down motor? I would worry about this test on an in service engine due to inducing a failure at the file gouge, as it could cause a stress riser and failure where there was none before. How often do these fail on say an untouched orig engine? All v8s an issue? 55 and 56?
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