Editing Intake manifold (section)
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==Intake heat shield== Many OE intake manifolds came equipped with a sheet metal heat shield. The purpose of the heat shield is to protect the bottom of the intake manifold from hot oil being splashed up onto it. This wasn't to keep the intake cooler, it was to keep the splashed oil from carbonizing on the hot exhaust heat crossover that runs beneath the plenum to provide carb heat. That said, if the heat crossover has been blocked off, the shield would tend to help keep the hot oil off the intake. But after the engine has heat soaked, the underside of the intake will be close to the temperature of the rest of the engine, anyway. ===Removing the heat shield=== During use, the heat shield can become occluded with built up carbon. This can be cleaned out by removing the heat shield. Use a sharp, gradually tapered 1/4" chisel to get up under the edges of the rivets (you might need to grind a chisel down to get the best tip. Don't grind until red hot or the temper will be lost). The rivets used on Chevy intakes usually have spiral ridges on them that help hold them in position, so they tend to turn as they come out. If a rivet gets broken off in the removal process, do not worry. Leave the broken piece in the intake. Move a little to one side of the hole where the broken rivet is located and center punch and drill a new hole through the heat shield into the intake to receive a replacement rivet. A depth stop can be used to prevent the hole from being drilled too deep. ===Replacing the heat shield=== The shield should be replaced after cleaning. The intake can be tapped for screws or the rivet holes peened/staked to close them some so the rivets will have a good hold. The original rivets may be OK to be reused if they weren't damaged during removal, or new rivets can be bought to replace them. When replacing the rivets use locktite to help hold them in place. [[File:Heat shield rivets.jpg]] <br style="clear:both"/>
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