K-Seal is the easy-to-use, one-step permanent coolant leak
repair for all water-cooled engines up to 12 cylinders, including the
Northstar.
It will fix anything from a leaking radiator or heater core to a
blown head gasket or cracked block.
The unique formula contains no sodium
silicate and mixes with all types of antifreeze, so there’s no need to drain or
flush the cooling system.
It is ideal for workshop and emergency applications.