Brass Freeze Plug Kit Chrysler 383/440

The Brass Freeze Plug Kit Chrysler 383/440 provides essential protection for Mopar Big Block engines during comprehensive rebuilds or cooling system upgrades. These expansion plugs are designed to seal the sand casting holes in the engine block while providing a safety mechanism against internal coolant freezing. For owners of B and RB-series engines, replacing old, corroded steel plugs with this kit ensures a reliable seal that prevents catastrophic coolant leaks.

Constructed from high-quality brass, the components in this PROFORM 66558 kit offer superior corrosion resistance compared to standard OEM steel alternatives. Brass is the preferred material for professional engine builders because it does not rust or degrade over time when exposed to various coolant additives and water. The kit includes all necessary plugs for a complete block overhaul, ensuring a precise interference fit that maintains structural integrity under high cooling system pressures.

This kit is specifically compatible with Chrysler 383 and 440 cubic inch engines, as well as other displacements within the B and RB engine families. Mechanics and enthusiasts will find that these plugs provide a long-lasting solution for street machines, drag racers, or classic restorations. Proper installation requires a clean bore and consistent seating to ensure the engine remains leak-free for years of high-performance operation.