There are auto parts stores ALL over in the US. Lots of tools sitting on shelves. That’s not even the garages that actually fix engines, have actual lifts.
There’s tons of machining tools too. Nearby town for me isn’t that big and there’s to machine factories in it. 1/4 the town works in one of the two places. One makes parts of all kinds of engines, the other is more specialists as the custom make what their clients want in bulk.
If you don’t have the stock you melt down what you need, use clay for the first few molds. Then make molds from the original stock. That’s been done for a few hundred years.