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Originally Posted by alphajesse
The S2k and NSX 3.2L have forged pistons with FRM bores, and have no problems. The real key is to look at the metulurgy of OEM pistons for those engines, as well as skirt shape and factory clearances.
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Yup, high silicon content pistons, which limits expansion for tighter clearances. That, and they're also coated with iron . . . .