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This may be obvious, be another option to get a great HC engine is to bore out a used-up set of 90mm cylinders (2.7 Nikasil or Alusil) to 92mm and have them reprocessed to Nikasail. Then buy a set of J&E pistons at any compression ratio you want (9.5 or 10.5:1 are on-the-shelf). The bonus is that it's about half the cost of a set Mahle 2.8 RSR P/C, and will work with your stock 2.7 heads better than the RSRs. Just one option.
Good luck,
JP
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