I have been thinking about that article I read about just changing intake or exhaust rockers and I think the idea was to balance out the breathing characteristics of a motor which was more efficient on one side than the other. Some research might suggest which side of you motor needs improvement. For example: if power increasing mods for this motor include the increase of one or the other valve size, that would tell you which side needs improvement. Or maybe just a careful examination of your intake and exhaust system might give you a clue.
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