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Message: [QUOTE="Morgan@Midwest Diesel & Auto, post: 781620, member: 8143"] Once again, these are recommendations. You don't have to follow them if you don't want to. Just speaking from experience here of a lot of cammed powerstrokes that I've seen valve marks in when torn down. Even with stage 1 springs. And yes, with standard size valve diameter cuts @ .050" deep they are 2.1cc's. on a stock 6.0 displacement engine with .043" piston to head clearance the engine would be 16.3-1. Same calculation puts that same combo at 16.95-1 without valve reliefs. I agree that the compression is a bigger deal on a 6.0 then a 6.4. @3-5000 ft elevation it will make a larger difference than our shop @ 500ft. I can say at our elevation it makes nearly zero difference at all. But it only gets to -10 deg F around here in the winter at most. But hey when I had a brand new 6.0 it wouldn't start at -10 without being plugged in..... [/QUOTE]

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