Crane Cams valve springs and retainers can be used anywhere their physical size can be accommodated, and where the resulting spring tension and spring travel is compatible with the camshaft, rocker arms, and lifters. Different combinations of valve springs, retainers and/or locks can be selected to match your particular needs.<br>
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<b><font color="maroon">HERE IS HOW YOU CAN USE THIS INFORMATION</b></font><br><br>

<b>SPRING TO RETAINER CHART</b>This chart shows what retainers are available to fit a particular part number valve spring. It is based on the diameter of the spring and matching diameter of the retainers. It is further broken down by valve stem size, then the material and design of the retainer.<br><br>

<b>SPRING DIAMETERS</b> and <b>RETAINER DIMENSIONS</b> are provided so you can determine how the retainer fits the valve springs.<br><br>

Retainer Dimension "A" fits over the O.D. of the outer spring;<br>
Retainer Dimension "B" fits into the I.D. of the outer spring;<br>
Retainer Dimension "C" fits into the I.D. of the innermost spring. <br>
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<b>HEIGHT COMPARISON</b> - This is a measurement value for comparing the installed height of one Crane Cams retainer to another. This height comparison uses Crane retainer part no. <b>270-99914</b> as a starting point of .000 (zero). All other Crane retainers are either the same height, taller (+) or shorter (-) in installed height. For example: Retainer part no. <b>270-99936</b> is -.030" and part no. <b>270-99943</b> is +.100", so there is .130" difference in the installed height between the two. As there is no industry standard for retainer height comparisons, these dimensions relate only to Crane retainers.<br><br>

<b>AVERAGE SPRING RATE</b> - This is a ratio expressed in pounds of tension per inch of travel (#/in). It provides a means for estimating the approximate change in spring tension as installed height is altered. Multiply the average spring rate by the change in height, the answer is the change in the pounds of tension. For example: Spring part no. <b>270-99893</b> (when installed at 1.875") has a spring rate of 391 #/in., if you lessen the installed height by .050" the tension change would increase by (391 #/in. x .050")=19.5 pounds.<br>
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<b>SPRING TRAVEL</b> can be determined by subtracting the coil bind height "B" from the installed height "A". The difference "C" is the spring travel. Spring travel must always be greater (by .060" or more) than the full lift of the valve to avoid the dangers of coil bind.