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Strip Castings BareBlocks and heads should go to the machine shop buck naked, void of freeze and oil gallery plugs. The very first thing your machine shop should do is inspect and measure the block. If 289 bores check out at 4.040 inches or beyond, discard the block. If you must reuse the block because it is a matching number piece, it can be sleeved for approximately $100 per sleeve or $800 on average. If you're building an engine for performance, find a good block. The block must also be inspected for cracks and other non-repairable flaws.