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If you are going to bore the cylinders, you need the pistons to give the machine shop so they can bore/hone the cylinders correctly. Be sure to get the honing specs for the rings you will use. Be sure your machine shop uses torque plates when boring and honing.
If you want to use new 96mm cylinders and doubt the quality of the metal you can have them cryoed to stabilize the metal. I was told that aftermarket cylinders were not round or true, I bought a set of new 94s from A&A in San Francisco (made by Chen Shang), they were round, true and square. I had them cryoed (I love the newtech stuff) just to be sure they don't warp with heat cycles.
The pistons were lighter than KBs or Mahles and very close on weight matching. I just swapped the pins around and they were all within 1 gram.
Looking back, I should have spent the extra $$ on 96s or maybe 103s......
ken
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