Buy OEM 1968 Nissan Part # 11051-53J0A (11051-53J00, 11051-60U01, 1105153J0A). Engine Core Plug. Cylinder block and oil pan

Engine Expansion Plug. Engine Freeze Plug. Plug Blind. Plug Thread. Plug Welch.
Plug that prevents the engine block or cylinder head from cracking in case of freezing coolant. Also used to plug the casting holes from production.

PLUGPLUG-BLIND