Manufacturer's Part Number:
Summit Racing Part Number:
Kit includes two 6 1/4 lb. bags.
Choose In-store pick-up (OH, GA, NV) on our web site.
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.