compatible replacements for Chevrolet GM marine 3.0L 181cid 4-cylinder engines Strong torque for single or dual engine with inboard/outboard drive Good stock replacement cam. Replaces OEM # 3937765 or # 9341350. This listing is for a replacement marine camshaft and lifter kit with compatible replacements for Chevrolet GM marine 3.0L 181 cid 4-cylinder engines used in various marine manufacturer engines with gear driven timing.. P/N 807-400. This kit includes camshaft and eight (8) valve lifters. This Cam has Strong torque for single or dual engine with inboard/outboard drive. Good stock replacement cam. Smooth idle.Valve Lift:.441/.441 INT & Exh. Duration at .050" Int/Exh in degrees:204/204. replaces OEM #3937765 or # 9341350.