Not Ranked
I too have seen them in magazine articles (cleverly designed advertisements, really) but never seen them on anybody's motor. With the cost of them, you could built a heck of a 16 valve motor instead.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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