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Message: [QUOTE="TARM, post: 76709, member: 578"] No you are being very clear and I completely understood your question. I guess its actually you do not understand my answer and I certainly could have made it clearer rather than more leading you to the answer thru questions. No matter what the spring tension a set of springs has at any given seat height there is a specific spec seat pressure you want. Lets just say its 125. All valves etc in different engines wear at different rates or will have various mileage so varying degrees of wear. A valve spring has a fixed seat pressure @ any given specific seat height. As that is going to be different no only in each and every engine but can be different from each cylinder in the same motor it would be impossible for a valve spring to achieve the same seat height and thus seat pressure from engine to engine or cylinder to cylinder. Example: Install spring in a motor with 100K miles Cylinder 1 intake valve and measure its height its 1.80 Install in cylinder 1 exhaust valve its 1.815. Install in cylinder 8 its 1.78 on intake and 1.79 on exhaust. etc etc Then install engine with 250K miles Cylinder 1 1.90 intake 1.89 exhaust Cylinder 8 1.87 intake 1.86 exhaust. If the springs have a tension of say 450lb per inch of compression how could you ever achieve a consistent and even seat pressure from each cylinders intake/exhaust valve or from one engine to another without shimming to correct the different rates of wear. I guess you could custom machine each spring or machine each spring seat to get the same height but those are changes to hard parts. Much easier and changeable etc to use shims. [/QUOTE]

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