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Message: <blockquote data-quote="Dave70968" data-source="post: 3102200" data-attributes="member: 13624">Good article; it explains a lot.  In particular, "At high engine speeds, overlap allows the rush of exhaust gasses out the exhaust valve to help pull the fresh air/fuel mixture into the cylinder through the intake valve. Increased engine speed enhances the effect. Increasing overlap increases top-end power and reduces low-speed power and idle quality" sounds like I want reduced overlap for my application, as I'm more interested in a broad power band than in raw high-end power.</blockquote>