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You have 5 end gaps. Space them equally approximately 60 to 65 degrees apart starting at the recommended first position in the Porsche manual. It doesn't matter what the spacing is as long as you an adequate separation from one ring to the other without having two gaps in line for initial start up. Once you start up the engine the rings are going to rotate. Nothing you can do about that.
The reason for staggering the initial ring gaps is to allow for maximum compression and oil scraping upon start up. But once the engine is started up the rings will rotate and as stated there is nothing you can do about that. Hopefully that they will all rotate to less than the 65 degrees and no two gaps will be in line. But there is no guarantee that this will not happen during a running engine. There is nothing in the cylinder or the piston to stop the rings from rotating within the piston ring groves.
Don't over think this just set your ring gaps approximately 65 degrees apart and not have any groves at the piston pins and you are good to go.
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Gary Kozun
83 911SC Cabriolet
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