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Message: [QUOTE="windrunner408, post: 564938, member: 1868"] Actually according to the machinist, what you do is you tell him what you want the seat pressure to be and he puts the corresponding shim in to give you the required seat pressure so this way there is an even spring pressure accross all of the valves. He says that his "stock" springs are typically 80-90lbs so I just had him do 95 lbs and call it good. This way I get a little extra closing force without putting a whole lot of extra force on the lifters. Just my thoughts. [/QUOTE]

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