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The new guides will mean the valve will be seating slightly differently than with the worn guides which allowed it to seat however it wanted. Now the new guides will restrict the movement more so your leak down numbers may not be as good as before.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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