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Message: <blockquote data-quote="glittle75" data-source="post: 514882" data-attributes="member: 8675">it has nothing to do with max lift on a cam. NOTHINGits the duration that kills your PTV clearances. when your valves are at max lift, the piston is at least an inch down in the hole. how long ( Duration) you hold the valves open for is what gets you. PTV issues occur at .100 lift or lower most of the time, becaus the valve is being held open to long, and the piston smacks it before it can close all the way. im running Comp 274's (Stage 3) in my PI swap, and didnt have any issues. you just need to degree them to make sure the timing is PERFECT. i thought i had PTV issues with them, but it was just the valvetrain settling, 300 miles into the swap, and she's ready for dyno time. turned out i was just "overlistening" to the motor during break-in. you'll do it too, when you have work done, every little noise sounds like pots and pans falling</blockquote>