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Message: [QUOTE="TARM, post: 467645, member: 578"] I believe it was swamps and Wop that had pulled stock engines springs at around 100k and ford they averaged only 70-75lb. Consider what even correct tuning puts BP at when you are in the 25psi boost range. Add in that usually with perf tunes people tend to wind gears out more. For towing you are loaded more so Boston and Rome will tend to be up higher. Add in weak spring which the stock ones are .... it seems VERY cheap insurance to put proper tension springs in there. Not to mention why it is every replacement I have seen requires shimming to get to stock hieght. Add that also into the reduce spring tension of the stock springs and you have even lower operation pressures. IMO valve springs are a wear item that has a to be checked and replaced as needed especially when you are taking the engine outside its inteneded performance levels those springs were meant to operate in.ie. 15psi boost 3500rpms 200rwhp Anyways just my opinion. [/QUOTE]

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