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330-350-403 Oldsmobile Mondello neoprene rubber rear main seal that replaces the much out of date rope seal that came originally in these engines.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. Offered with rear main seal only or as a ultimate sealing kit. Ultimate sealing kit includes a 4oz. Gasgacinch can with applicator and a 3oz. tube of Permatex Ultra Black Oil Resistant Gasket Maker and oil pan gasket. Our oil pan gasket is a true oil pan gasket material, not cork like a lot of others available. The material we use is a rubber fiber oil retardant material that does not crack like cork does.
330-350-403 Oldsmobile Mondello neoprene rubber rear main seal that replaces the much out of date rope seal that came originally in these engines.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. Offered with rear main seal only or as a ultimate sealing kit. Ultimate sealing kit includes a 4oz. Gasgacinch can with applicator and a 3oz. tube of Permatex Ultra Black Oil Resistant Gasket Maker and oil pan gasket. Our oil pan gasket is a true oil pan gasket material, not cork like a lot of others available. The material we use is a rubber fiber oil retardant material that does not crack like cork does.