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Discussion Starter · #1 ·
Or casting marks? It's the webbed underside of an FPT gearbox (91/92) that I'm cleaning up and getting ready to swap to my car. I noticed these lines. They look like casting marks because they're raised, but I'm not 100% sure. Is this a normal surface defect? Thanks for your thoughts.

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Casting lines. Sand molds are rarely perfect. Looks like someone scratched the mold during setting.
 
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