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A87 head is stock on L18 correct?
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Of course you won't know if it's open or closed chamber until you take the head off. US-spec ones were open.
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Any performance difference between open chamber a87 vs u67?
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U67 has bigger intake ports and exhaust valves may or may not be bigger. A87 would have snappier low-end response, but run out or air faster at higher RPMs.