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Safe distance between stock valve seal and retainer for max open valve?

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I have a moderate lift cam that I have measured to about 0.480" (Shadbolt M445). 


When the valve is open max there are some margin between the top of the seal and the top of the retainer. What is a good safety margin? 


Rebuilding the head, curious if I should get stock seals or the Ford ones (ford ones seems harder to install).



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