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Message: <blockquote data-quote="ossagp" data-source="post: 171187" data-attributes="member: 1650">I deal with vacuum all day long.  Consistent and being able to get "leak free" is the key.  I feel. I have seen lots of cylinders that flowed well (most won't know that "well" really means) and the bike was slower than stock.   If you have someone that claims he knows porting and tells you it is about reducing vacuum and doesnt mention the relationship with maintaining volume or what some think of as the ratio between lost vacuum and gained volume it may be time to shop for your porting elsewhere.  Timing to me has been more important when it comes to ports than anything else.  It is really pretty amazing what a small change in stroke can make.  Maybe my next shot at building a fast(er) 500?</blockquote>