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I appreciate the discussion... now for my real world observations. A new spring has increased the oil pressure at idle compared to an old spring with 2 washers under it. The next test would be to try more washers under an old spring to see it that would bring the pressure up. Someone else can try that as I have already bought new springs for all my engines. I am using my old pistons with a chamfer "machined" into them. Machining was by using a belt sander.
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Grant
Arctic Silver 2000 Boxster S - bought with a broken engine, back on the road with the engine replaced
Green 2000 Boxster 5-speed and 1978 928 auto
1987 924S 5-speed (Sold) - Blue 2000 Boxster 5 spd (Sold)
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