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Though the SHP block will accept all of the OEM hydraulic roller components, we went with COMP's new short-travel retrofit-style lifters to minimize the potential for hydraulic instability at high rpm. These units cut down plunger travel from .200 inch, to just .012 inch. The benefit is easy valve lash adjustment (just set it and forget it like a normal hydraulic lifter), with the high-rpm reliability and extended lift of a solid roller lifter. The sweet solid roller valvetrain tone is just icing on the cake.