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I think I just answered my own question. Below are links to Tecumseh engines where they actually specify that the cylinder is aluminum. Also if you go into the products section and then select utility engines then Formula®, they compare all their models, where you can actually see that some...

Will, I'm very sure that the Briggs engines have aluminum bores, basically, you could scratch the bore with your fingernails, and I've seen this on two Briggs engines and a Tecumseh also. As a selling advertisement, Briggs offers "Cast iron Cylinder!" as engines alternative to aluminum...

From disassembleing these engines for repair, I discovered that the cylinder bore is made from aluminum with no hardening treatment at all, unlike chainsaw engine which are aluminum but have a hard chrome treatment. Now how is it possible for the engine to not wear out?. Is it because enough...