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so u reckon i should go for 263 instead of 268 what the diff

well as far as I understand it mate, the number refers to how long a valve is opened in relation to crankshaft rotation. More duration is useful in high rpm engines but not low rpm ones, at lower RPMs, more duration can cause less power because the valves will be open at the wrong time in relation to the piston's stroke up or down in the cylinder. So I went for the 263's because they give you more low down power where inmo the VR engine needs it :)

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