Fact Vs. Fiction On Hydraulic-Roller Cams
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The biggest problem with hydraulic-roller cams is that the tall lifters are heavy. The added weight makes it difficult to control at high rpm without using stiffer valvesprings. Unfortunately, heavy springs tend to collapse hydraulic lifters at high rpm. AirFlow Research sells a Hydra-Rev kit for the small-block Chevy that adds rpm by adding spring pressure to control the lifter body. View Related Article
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