Find helpful customer reviews and review ratings for COMP Cams 12-214-4 Magnum/Drag Race 253/253 Hydraulic Flat Cam for Chevrolet Small Block at Read honest and unbiased product reviews from our users.
Apr 13, 2007 · Comp's Pro Magnum roller rockers are designed to be an effective middle ground between inexpensive aluminum rockers and extremely strong and reliable, but more costly, stainless steel rockers.
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Valve Spring Tech. As is widely known, the most important aspect of selecting a valve spring is to get a spring with the correct seat pressure, open pressure, and spring rate for the cam in the engine and with the rev limit that will be used kept in mind.