Hard Blok Water Jacket Filler - Tall Fill 860228

Water jacket voids compromise cooling efficiency and invite corrosion that can silently damage your engine from the inside out. Hard Blok Water Jacket Filler seals those cavities permanently, ensuring consistent coolant flow and protecting cast iron and aluminum surfaces where traditional coolant alone falls short. Whether you're rebuilding a race engine or restoring a classic, this is the proven solution for long-term durability and reliability.

• Engine block filler
• Tall fill design
• 28 lb bucket
• Permanent void sealing
• Corrosion protection
• Sold individually