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0312phr Buick445 04 Z

The block has been filled with Hard-Blok to the base of the water pump holes to add bottom-end rigidity. Kent says street 455s can live with this mod, but he'd have probably used a bit less filler and allowed for a greater quantity of water for a dedicated street engine.
Setting the Stage

The block has been filled with Hard-Blok to the base of the water pump holes to add bottom-end rigidity. Kent says street 455s can live with this mod, but he'd have probably used a bit less filler and allowed for a greater quantity of water for a dedicated street engine.  View Related Article