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The COMP Cams 47S 312-R8 camshaft with a .900" base circle is intended for very large displacement engines (400+ ci) with good heads and high compression, and it’s specified for high-performance applications. The listing advises the usual 1955–57 SBC rear journal oiling groove compatibility check. This cam targets heavy-duty, high-compression small-block builds.
COMP Cams Camshaft CS 47S 312-R8 .900 B
