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What I can say is that if the springs have a flat-spring damper between the coils, do NOT run ti retainers on the street. The damper will wear a groove into the retainer.

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One of my customers in N.Y.(9 seconnd Phil,R.I.P. ) had that happen after 23,000 street and strip miles The inner dampener ate right through the Ti retainer The Ti retainer held the valves in place so he got away with no engine damage Tool steel from then on on any motor that has a inner dampener on the valve springs