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This is a little information about engine valve springs. When talking about valve springs there is some industry lingo that confuses most people. First is I/H, Installed Height. What this is referring to is the distance between the head and the underside of the retainer when the valve is closed. This is important so you know what your spring pressure is when the valve is closed. Second is C/B or coil bind. This is the measure of the spring when it is completely compressed. And lastly is all springs have a “rate” this is the amount of pressure the spring will produce per inch of travel. This is an average over the springs sweep. Obviously some springs do not have an inch of travel so you can figure the pressure by dividing the rate by 10 and that will be the pressure every .100 of lift. Again this is a calculated number and really should be checked on a spring pressure tester.

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