330-350-403 Oldsmobile Mondello neoprene rubber rear main seal that replaces the much out of date rope seal that came originally in these engines. We have been selling this exact rear main seal for 50+ years, as it is the only one we have found to work perfectly in these small block Oldsmobile engines. Available as rear main seal only or as rear main seal and oil pan gasket set.
330-350-403 Oldsmobile Mondello neoprene rubber rear main seal that replaces the much out of date rope seal that came originally in these engines. We have been selling this exact rear main seal for 50+ years, as it is the only one we have found to work perfectly in these small block Oldsmobile engines. Available as rear main seal only or as rear main seal and oil pan gasket set.
