LS2 truck engine

I’ve heard there is a really good factory LS intake manifold out there for cathedral port intakes but the friend who mentioned it didn’t know anything more than that. He said it was from a truck or an SUV but he wasn’t sure. Do you know what he’s talking about? I have a ’69 Chevelle

[Editor’s Note: This LS2 engine upgrade guide is part of a series of LS engine upgrade guides assembled by a team of LS experts at Summit Racing that we are sharing at OnAllCylinders. The LS2 is noteworthy within the LS engine family in that it appeared in both cars and trucks (as did the L76). The car