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3.8mm is how far open the intake valve is when measured at TDC using a dial indicator. Note that minimum piston to valve clearance usually happens earlier than TDC.
Edit: Walt beat me to it.
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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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