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這個網站有寫歐
http://www.focussport.com/cams.htm
Part # FSYD0224 & FSYD0173 and FSYD0223 & FSYD0182 are going to need upgraded valve springs and valve relief in your pistons, regardless of how high you plan on revving your engine.
翻譯軟體翻的是說,必須更換汽門彈簧及在活塞上做汽門雕刻,取決你想要提高引擎轉速到多高
好像是2個都要做耶
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