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Message: <blockquote data-quote="stang94X" data-source="post: 482816" data-attributes="member: 9515">What would cam size have to do with the bottom end - do you mean piston and the reliefs?The only reason to worry about lift would be valve float. Lift has nothing to do with PTV clearance. Duration is what you want to look at bud.As far as 1.94 valves and a stock piston, I know a lot of people running a 1.94 intake valve and a stock rotating assembly.</blockquote>like i said i dont know how true it is, thats just what ford racing told me, and yeah the lift of a cam does come into play with ptv clearance, and yeah the diameter of the valve can also cause clearance issues, and duration is just how long the valve stays open and closed but with to high of a lift...bammmm...piston smashed a valve[/QUOTE]