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3a.The new single-plane intake manifold uses the factory-style O-rings (not provided with the manifold) to seal to the cylinder heads, which plays right into the no-hassle nature of this engine. GM made it very easy to work on the LS thanks to O-rings like these. There's a small amount of casting flash throughout the plenum and intake ports in the manifold that could stand to be smoothed out. We wanted to test the manifold as it came out of the box though, so we left it alone.