Chev 181 4cyl 3.0L New Marine Long Engine Mercruiser Volvo Penta OMC 181LNMSRChev 3. 0L 181 4cyl New Marine Long Engine Mercruiser Volvo Penta OMC # 181LNMSR This is a factory brand new 3. 0L 181 c. i. Marine Base Engine. This engine will replace those 3. 0L marine engines used in Mercruiser, Volvo Penta, OMC, Crusader, Indmar and other applications between the years 1967 present. This is a perfect stock replacement for those engines that have suffered from a cracked block due to improper winterization or another type of