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The problem isn’t the plastic, it’s designing that same plastic part in the same way we built aluminum products.
Plastic is soft, ages and distorts over time and generally needs far more ribs/gussets and additional material for it to compete with metal.
Trying to save weight where you shouldn’t is the engineering issue, I should never have to replace a $500 valve cover because it cracked or warped from age.
End of story.
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