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Hard Blok Engine Block Filler

4.38 out of 5 stars 16 Customer Reviews

Toughen up your engine block! Hard Block has the optimum ratio of graded iron for strength and vibration dampening. Its thermal coefficient is nearly identical to cast iron, and also proven to work in aluminum blocks. It won't shrink or pull away from cylinder walls. It is stable when exposed to water, anti-freeze, and high temperatures. It is available in a pre-measured Short Fill (12.5 lb.) container to partially fill the jackets of your street or Oval Track engine, or a Tall Fill (28 lb.) container for drag racing.