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The valve is safely in it's pocket when the piston is at TDC. The piston and valves are closest several degrees before and after TDC. The cam timing and the cam profile determine where this occurs and how close they are.
-Chris
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'80 911 Nogaro blue Phoenix!
'07 BMW 328i 245K miles!
http://members.rennlist.org/messinwith911s/
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