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Message: [QUOTE="KCTurbos, post: 1338392, member: 13852"] Another thing people don't think about and monitor is Drive pressure/ebp. Those stock valve springs only start out at about 70-80lbs of seat pressure. After a couple hundred thousand miles they probably only hold about 55-65lbs of seat pressure. That means if your ebp ever gets that higher than 55-65psi then you can hang open a valve. It does not take much to kiss a piston when your valves are not closing properly... Doesnt really matter what cam you have.. if you are building 40-50psi of boost, and not monitoring EBP... then you are taking a big risk on stock valve springs IMO. On 6.4 compounds or smaller 6.0 vgt turbos... 40-50psi of boost can easily hit 55-65psi of ebp. Bigger non-vgt probably don't have as big of an issue, but I have never monitored ebp on one [/QUOTE]

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