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I totally agree from recent experience. An aluminum piston and piston head can cause all sorts of problems.
To be honest I have yet to see anything documented or made into a theory as to why aluminum pistons and piston heads are made at all. With the ability to mold pieces as well as they do, machining seems to be more expensive and in the end cause more problems then solve. Ok aluminum piston heads may hold their shape better ... but by how much and how much of a performance increase would you see, then weight that against the disadvantages. *shrugs*
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