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Tech / General EngineIs your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!
Can anyone tell me what these holes on the side of my intake are? It’s an Edelbrock Vortec performer rpm and the whole are 1/2 inch. I’m confused what I could possibly use these for. Also is the hole under the carb the only vacuum port? Because I have a brake booster to run to it and a pcv so am I just supposed to run them to a T kind of thing?
there not for egr, it's for an old style thermo choke, the exauast heats up en element and the choke linkage opens the choke up, that's y its under the linkage, if it were egr it wouldn't be threaded, it would be part of a triangular flange w a hole going to the intake and 2 bolt holes
Last edited by lewandom; Sep 13, 2023 at 04:34 PM.
there not for egr, it's for an old style thermo choke, the exauast heats up en element and the choke linkage opens the choke up, that's y its under the linkage, if it were egr it wouldn't be threaded, it would be part of a triangular flange w a hole going to the intake and 2 bolt holes
Not even close, the choke thermostats use a rectangular opening with a bolt hole on each end. Those holes are there to route coolant under and around the plenum since vortec heads do not have an exhaust crossover passageway to heat that area. I have owned and run that manifold and had the coolant plumbed up.
