Mine actually seemed to be made of the stuff similar to what carburetors were made of in the old days. Not sure there is a lot of aluminum in them.

Also aluminum conducts heat so fast that it goes from solid to liquid so fast it is difficult to control it.

As an example those alumiloy repair sticks/rods have a lot of Zinc in them not aluminum. I have tried to use those on some stuff and when the base metal melts it flows away before a repair can be done.

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84 300D, 82 Volvo 244Gl Diesel