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I have ordered a telescoping bore gage. I can use the gage to measure the distance between the retainer and the seat. I can have the inner spring of my spring set in place when doing this measurement. The stack would consist of retainer with keepers in place on top, inner spring in the middle, and valve seat on the bottom.
Any shims added below the valve retainer would decrease the installed height.
The part number of the shim from Porsche is 930-105-461-00. The thickness of the shim is 0.50mm. This is the only shim thickness produced by Porsche for a 911.
Last edited by RSOHC; 08-05-2023 at 05:46 PM..
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