The MOST-Likely method used to clean ferrous parts such as the block, heads, and sometimes crankshafts and connecting rods is:

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Shot blasting is the most commonly used method to clean ferrous parts such as engine block, heads, crankshafts, and connecting rods. This process involves blasting tiny particles (shot) at a high speed onto the metal surface, removing any rust, paint, or other impurities. It is effective in removing tough stains and provides a uniformly clean surface for further processing.

The MOST-Likely Method Used to Clean Ferrous Parts Such as the Block