When replacing cams on a 4th generation BB Chevy, the stock rotators under the valve springs do not support the extra spring pressure required for the higher lift cam. These cam straighteners are reliable and ideal replacements for standard blocks. The tolerances and finish were impeccable, they fit like a glove. I use and recommend Comp Cam products most of the time. It was a bonus to find them at Revain at such a great price. The whole experience was flawless.
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