Hi there. My standard air box for the 455 motor looks like this. Can anybody guide me as to what the additional items are and where they connect to (carb? exhaust manifild?). Can I "delete" them?
The items circled are intended as part of a system to supply thermostatically-regulated, heated air to the carb to prevent carb icing and to speed warm-up. Carb icing is most common when the outside temp is about 40--45 degrees and raining. It'll stall the engine, and the engine may not re-start until the ice melts. Carb icing was a hateful mess before heated air intakes like yours. The better way to deal with this is to simply pull the vacuum hose that powers the thermal sensor. Plug the nipple it connected to on the carb, to prevent a vacuum leak. Instant "cold" (engine-compartment temperature) air all summer. Then return the hose to the vacuum nipple for fall, winter, and spring. Or just leave it plugged-in year around like GM intended. You already have the two vacuum hoses--carb to thermal sensor, thermal sensor to vacuum motor (on the snorkel). The duct hose that goes from the elbow under the snorkel to the heat-stove on the exhaust manifold isn't in the photos.
here is the pre heater hose that goes between the air cleaner and exhaust manifold stove. https://www.summitracing.com/parts/...MIverK65nM4wIVkZ-fCh2r3QtdEAQYAiABEgLeO_D_BwE One side of the temperature sensor in the air cleaner goes to manifold vacuum.