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WebAug 1, 2006 · A typical aftermarket street performance head for a big block Chevy might have 265 cc oval ports. A big block racing head, by comparison, might have port sizes ranging from 300 to 420 cc’s or greater depending on the rev limit of the engine. WebConvinced you must give up performance with cast iron, stock looking parts? Wrong! Yes, you can retain your stock look and have exceptional performance, too.... mr-s シーケンシャル 壊れやすい
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