Chevy Small Block - Secrets Of The Cheap Hydraulic Roller Lifters
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This is a comparison of the standard-style small-block cam nose (left) versus the '87-and-later factory hydraulic roller cam arrangement (right). Note that the factory hydraulic roller uses a step. This stepped nose with a smaller bolt circle must match the cam gear. That means there are two different cam gears for the small-block Chevy depending upon the cam chosen. View Related Article
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