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I spoke to someone running a Crane hydraulic roller in a 351. He said he couldn't rev it past about 5800 rpms. He was preparing to switch to a solid roller cam. As I understand it the lifters are very heavy. As a result very high valve spring pressures are needed. At high rpms the high valve spring pressures cause the lifters to bleed down or collapse thus limiting your power at those higher rpms. Roller cams are great because of the more aggressive cam lobes but I'm under the impression that hydraulic rollers are not nearly as aggressive in general as sold rollers. Because of the above concerns and the significant added expense of a roller cam, I went with a solid flat tappet cam.
Chris
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