All Weather Engine Seal
Moroso's secret formula was specially developed to stop cooling system leaks. Perfect for stopping radiator leaks and sealing minor cracks in blocks and heads caused by sub-freezing conditions. Run with antifreeze, and then drain within 24 hours. One pint.

Ceramic Engine Seal
Simply the best chemical sealer you can buy! Ceramic Engine Seal has saved the day for many an oval track and drag racer. Works equally well in aluminum or steel blocks and heads. If this won't seal it, you'll have to weld it! Does not work with antifreeze.