Anybody know when they changed the intake manifold on the 3.8L engine from Aluminum alloy to plastic? Reason for asking is because a buddy of mine has had about 6 3.8L engines in various cars, all Pontiacs, and I've had 2. My first was a '91 park avenue ultra, and now I have an '09 Lacrosse. I did a valve job on my old park avenue, and the intake as I recall was Aluminum alloy. I know it wasn't plastic. When my buddy told me that all of his were plastic, I started wondering. He even said my Lacrosse is plastic. I haven't checked yet, because I haven't taken the cover off yet to check. If what he says is true, then when did Buick change from one to the other?
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