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Plus I think I read that once duration gets too high, the stock Gen III engines run into piston to valve clearance issues, someone correct me if I'm wrong but I think that's an issue as well

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Spot on - 228 Intake is about the limit with the 6.1

The Arrington ST3-A runs this intake duration and AJ from that company confirmed to me that P-V was pretty tight but they get away with it.

But back to the duration question - these are Hyd roller profiles...so its apples and oranges comparing to the old LA flat tappet.

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