sjh,
Welcome to the Forum

You are in the ‘right’ place.
You will find a lot of help here.
Please don’t buy a 911 without a through PPI or two from independent (of the seller) experts.
There has been a lot of discussion here about everything from what a PPI should include to what it cannot tell.
Start the process by taking a friend (Pelican, PCA, other) who
knows Porsche to inspect the 911.
Even on a 911SC or Carrera, rust and prior crash damage repair can be an issue.
My best advice:
Look at a LOT of cars. Educate yourself.
Keep
your money in
your pocket until
you are sure.
Post details here for critique. You will get a good, wide range of opinion and good (free) advice.
Pay top dollar for absolutely the best example you choose to afford.
Retain 30%+ for unforeseen issues.
Buying a 911 with a rebuilt engine or transmission should include every detail of the rebuild.
That includes parts invoices, machine work invoices, dimension measurements and photos.
There
are many very good, experienced, professional engine rebuilders
(MM notwithstanding).
Many ‘DIY-rebuilds’ rival professionally built engines and should include even more documentation.
Just to be clear:
Neither a cylinder leak (leakdown) test nor a cranking compression test can damage an engine.
They just tell you the truth about condition.
We should all feel for the owner who probably spent good money for a *** rebuild.
He only drove his 911 300 miles in the past year.
Look at his resale potential.
Another candidate for a ‘class-action’.
Best,
Grady