Paul why do they use the inserts?
Royce

Good question. My guess is the exhaust would erode cast iron.

Paul Lamar

Paul & Group, One other possibility on the inserts. Manufacturability: the port shape may be hard to cast in. The insert allows
a simpler casting, then the insert is put in.
Just my best guess, but when the japanese factories do ANYTHING different you would do well to guess there is a yen involved.
Bill Jepson

 
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