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The COMP Cams CS 289Tkn‑R7 (.900BC) camshaft is specified for 383–415 ci late‑model engines and is recommended where a 1.6:1 rocker ratio and good heads are present to realize torque and top‑end gains. It’s presented for racers building late‑model packages that match those valve train and head requirements. Note: 1955–57 small‑block Chevy engines with a rear‑journal oiling groove need a different cam—contact us.
COMP Cams Camshaft CS 289Tkn-R7 .900Bc
