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Markus,
The photos I sent were adjusted by me to try and make the stamped numbers more legible - I had read somewhere that Porsche used to hand punch / stamp the engines that were rebuilt...I did have a sample from another boxster I found online that was done like this so I am fairly sure this went on. Also as far as I can tell the numbers are there (although the corrosion has made it hard to see them)
My concern is that the last 5 (serial numbers?) do not match the original engine number shown on the bonnet underside label or documents / service book.
Regards Dave
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