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For like another 115 bucks a head you can get the CNC ones.
 

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Are you asking about the stock rocker limits or the max valve lift of the head? Stock rockers can handle .650" lift. I ran that much lift for 30,000 miles. I don't know about the max valve lift.
 

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Discussion Starter #5
I am asking when do you run in to trouble with the retainer/locks hitting the seal. And if there is a retainer/spring combo that with allow that lift.
 
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