The COMP Cams CS 272TLS-6 camshaft is intended for 305–350 ci engines used on 1/4 to 3/8 mile high‑banked tracks in heavier cars with limited intake and carburation. The supplier notes that 1955–1957 SBC blocks have an oiling groove in the rear journal and the listed part may not fit those blocks; contact the supplier if you need a grooved-journal camshaft for those early small blocks.
COMP Cams Camshaft CS 272TLS-6