Just wanted some opinion on removing (Thing below carb not sure what its call.) It just seem to me its just heating the fuel charge and causing fuel milage and power loss. Reading other things about intake about why they install splash sheild to keep hot oil from heating underside of intake and warming up incoming fuel charge. It seem that the other thing is defeating the purpose
Thanks in advance.


99 F350 7.3 CC Dullie
68 F100 390 C6
67 F250 300 4 Speed
70 F100 302 4 Speed
95 Seaswirl 20' 5.0 EFI Corbra

 

I'm guessing you are talking about the EGR valve. Here in WA if you blow the right stuff out the tailpipe, they aren't going to be looking under the hood. They will only inspect if you fail twice and want a waiver. I have had a more than a few mechanics and parts guy's tell me I don't need it (wink wink) and I have had the speed shop guy that has been helping me tell me that they aren't bad things and perform a function. My running 390 doesn't have one, my dissassembled 302 wasn't running one before I tore it down (crank walking) and it ran fine (fuel delivery anyway). The emmissions standards are specific to the year of your vehicle (in WA) and aren't very demanding for 60's and 70's vehicles compared to 90's. I compared the slip for my 76 F100 to the slip for a 92 Ranger I had and there was a big difference. The standards in 76 aren't any different for Catalyst vs. Non-catalyst motors. I believe (although not positive) that the EGR (Exhaust Gas Recirculation) has a function while the engine is coming up to temperature.
BBT

 

Thanks BBT, It going to be that piece which has Coolent running thur it, On a 68 FE Thanks again

 

Hey GWB, the spacer underneath your carburetor is heated by coolant running through it. It’s purpose is to prevent carburetor icing during cold weather operation and to help emissions. In warmer climates you can probably remove it without encountering any driveability problems. In fact, if you were running an aluminum manifold, the heat transfer of the manifold to carburetor is much greater than the cast iron unit and you might consider running an insulating spacer instead.

As far as the shield underneath the manifold, to my understanding it’s purpose is to keep the heat that originates from the manifold underside from coming into contact with the engine oil in the lifter gallery and forming coke deposits on the bottom of the manifold. There is an exhaust crossover passage in the manifold that connects the two banks of cylinder heads and it gets very hot. The crossover keeps the atomized fuel in suspension as it winds around the intake passages instead of hitting the cold manifold walls and condensing back into liquid. For street use you want the crossover but for all out racing they sell intake manifold gaskets that block this crossover passage. Hope this helps.