COMP Cams 8959-16 Hydraulic Roller Lifters User Manual
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COMP Cams®
3406 Democrat Rd.
Memphis, TN 38118
Phone: 901.795.2400
Part #COMP4-140
Revised 3/22/12
Toll Free: 1.800.999.0853
www.compcams.com
You now have two marks on the pushrod: one with the assembly bolted into place as the engine
will run and the second mark with the lifter unloaded. The distance between these two points will
represent the amount of lifter pre-load. If the pre-load is not within 0.050" to 0.100", adjustment is
necessary. The simplest way to accomplish this is by using different length pushrods. When
measuring to find the correct length needed, be sure to include pre-load that the lifter requires
(0.050" to 0.100"). If the engine uses pedestal mount rockers, shims can be placed under the
pedestal to reduce the pre-load. The stands on shaft mounted rockers can also be shimmed in this
manner. Longer pushrods will be needed for insufficient pre-load
.
In most cases, only one intake and one exhaust pushrod will need to be checked. If the valve stem
heights are not equal, then pre-load will have to be checked on each valve. If you do need custom
length pushrods, call CAM HELP® at 1-800-999-0853. COMP Cams® offers a variety of
pushrods in most lengths.
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