Bet you didn't know your 361, 383, 426W, or 440 engine originally had noise insulation between the intake manifold and the pan! Used on ALL VERSIONS of these engines, silencer package #1879-747 is two pieces of fiberglass insulation wrapped in tinfoil, as original. It is POSSIBLE to install these exactly reproduced pieces after your manifold is already in place, but it's much easier to do like the factory did. They were placed on the pan, large piece in front, small piece in rear, then the manifold was bolted in. These pieces should have engine paint overspray

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