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What year SC ? Alusil or Nikasil ? Factory turbo parts are a better choice, the pistons are forged, SC pistons are cast and some of these cars, when new, had a problem with broken piston lands even in N/A form. Also see the archives for failed SC turbo engines.
If you are even considering putting it on a track, split the case, new bearing, upgraded pump, send the rods to Henry and go with a new set of turbo pistons/cylinders and turbo exhaust valves. You will also have to have the heads milled flat. If you really want higher compression get the Mahle Motorsport version.
If you are using later SC heads, there is the mismatched port size to consider.
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Paul
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