Hard Block Engine Block Filler, Short Fill, 14 lb Small Bucket, Each

Hard Blok Engine Block Filler – Part #860212 (Short Fill)

Hard Blok 860212 is the trusted choice for engine builders who need to reinforce performance engine blocks. This short-fill kit is supplied in a 14 lb bucket (two 6.25 lb bags), ideal for small grout fills in V8 blocks where maximum water flow is still required for street or oval-track use. The specially engineered cement and iron-infused formula matches the thermal expansion of cast iron, strengthens cylinder walls by supporting them all the way around the bores. Hard Blok also helps reduce bore distortion under high horsepower/cylinder pressure loads.

Since 1986, Hard Blok has produced their uniquely formulated cement-based Water Jacket Filler with refined, size-graded iron particles to strengthen high-performance race engines while improving vibration dampening and heat dissipation. Optimal for cast iron blocks but also proven effective in aluminum blocks, Hard Block helps protect engines under the most demanding racing conditions.

Key Benefits

• Increases block strength and rigidity

• Reduces vibration and cylinder wall flex

• Maintains better ring seal under load

• Short-fill design still allows coolant flow for street/strip use

• Will not shrink, erode, or soften once cured

Specs

• Part Number: 860212

• Package: 14 lb bucket (two 6.25 lb bags)

• Type: Short Fill (fills lower water jackets only)

• Material: Cement base with iron aggregate

• Cures to match cast iron’s expansion rate

• Safe for use with cast iron and aluminum blocks

Applications

• Fits most small block and big block V8 engines (Chevy, Ford, Mopar, Pontiac, Oldsmobile)

• Recommended for street/strip builds, circle track, drag racing

• Ideal for engines up to 700+ HP where cooling is still required

• Perfect choice when full fill is unnecessary

Notes: Recommend to monitor engine oil temps as grout filling is known to increase internal temperatures of oil.