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You can purchase new main bearing caps, but it will need to be fitted to the block by someone with line-boring equipment.

Let someone with rebuilding experience look at your situation to see if a new cap is truly needed. Another Answer The above is good advice. If the main cap is not damaged structurally, and depending on the size of the "chips" it may be better for you to just plan on using silicone sealant to fill the imperfections. Sometimes a cast piece can have minor imperfections, and if it doesn't affect the structural integrity of the piece it may be used anyway. As advised above, have someone with a little experience look at the cap. A good place to start would be the machine shop that cooked the block and bored the cylinders. BTW, if the machine shop has seen the cap and let it go it's probably just fine.

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Q: You are rebuilding a Chevy 350 for the first time you found that the rear main cap on the outside flange has chips out of it where the oil pan gasket would sit Can you replace the cap?
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