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Not everyone is referring to the LS1.
Basically, I have learnt to refer to the plastic upper intakes as
"expensive, cheap intake gaskets"
because that is basically what they are.
The major problem is with warpage, just think of the warpage difference
between steel and aluminum, and double it to see the difference between plastic and aluminum. Which is sad, because there are composites out there that could do a much better job, but aren't being used.
 
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