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mrmax,
Nikasil is used by Porsche, Mercedes and BMW, NASCAR teams as well as OE aircraft applications. (Jack Roush used it in his P-51 Merlin).
It is very hard and long-wearing. Domestic manufacturers are most likely put off by the cost, about $1000 for a V-8 on a one at a time basis - so even if you were doing thousands of them it's still costly compared to sleeves.
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