Hard Blok 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.
Needs approx. 1.5 buckets to fill 5.9L & 6.7L block
Part number: 860228