This makes sense. It sounds like what the construction industry uses
called "metallic non-shrink grout". Even though it is based on portland
cement, it has been formulated to have different properties and these
properties would make it more appropriate for use within engine block
water jackets.
> And from the Summitracing web site:
>
> http://www.summitracing.com/parts/HNH-860228/
>
> 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 nor 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.
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