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As the owner of an 82 911SC (USA version) currently undergoing head stud replacement, and if I had the opportunity all over again to shop for an SC, this would be my approach:
1) Contact your insurance agent and get a firm quote on the required insurance. This I did, and since I'm in the near age 50 group with multiple cars it wasn't shall we say "unreasonable" for the required/desired coverage. If you are less than say 30 years old and this will be your only car.....watch out!
2) Replacing the head studs will require the engine to be torn down to at least the "short block" i.e. case and crankshaft.
a) Check the engine ID number to make sure it is indeed a ROW engine.
b) Perhaps others can confirm what should be there with a ROW engine should the ID indicate, search the 911 engine rebuilding forum and learn how to distinguish, by counting the cooling fins of the cylinders from underneath the car, whether or not the engine has the Mahle or KS pistons and cylinders. If they turn out to be the KS versions that can be a whole 'nother world of hurt; again search the rebuild forum for the 29 page thread on re-ringing KS pistons and cylinders. IF they turn out to be the Mahle version you might be ahead of the game for step c.
c) Get a competent 911 mechanic to perform a compression and leak down test as part of the PPI (Pre Purchase Inspection).
If you've made it this far, it's all about the final $$$$$ negotiations.
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