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Message: <blockquote data-quote="shovel" data-source="post: 1587409" data-attributes="member: 29855">The lower manifold has coolant and the thermostat housing in it, and more critically many small block ford heads have the exhaust crossover ports in them so a plastic lower intake is probably not on the menu. For the upper manifold an EGR delete is pretty obvious but lots of people do that anyway.. beside that a plastic upper manifold is possible I just don't know that there would be enough demand for it, tooling isn't cheap especially when the finished product needs to meet a lot of requirements like heat resistance, oil and chemical resistance, gasket surfaces,  threaded inserts, etc.  that's a pretty high cost product to develop.There is of course the option of having no upper intake at all[ATTACH=full]49671[/ATTACH]</blockquote>