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The TRW is a flat top with four valve reliefs, not a dome high compression piston according to the information on Summits site you attached to I thank it is a stock replacement forged Speed Pro piston wit a compression ratio of around 8.5 to 1, maybe not The KB is a domed psiton so it should have the higher compression your looking for



Yeah, I think there´s an inconsistence in Summit´s site....