273 4 bbl sheet metal plate underside of intake manifold
Rusty et al,
As I mentioned when I started the part wanted ad, I recognize that not all agree on the need for the shield (plate), and I don't want to turn this into a debate, but I will respond to your suggestions as follows:
<There are plenty of heat paints on the market that would do just as good if not better job of that piece of metal. Red Glyptal comes to mind. It also has fantastic oil drain properties that aids in oil runoff>
Glyptal is good stuff, proven to facilitate oil runoff from rough engine castings, I agree. In this application however, I fail to see how Glyptal or any other "paint" would have the heat insulating ability created by the air gap between the plate and the underside of the manifold exhaust passage. Exhaust gas temps get into the 500 degree range, and conventional oil will flash burn at those temps, turning into coke on the underside of the manifold.
<There are tons of modern carburetor insulator gaskets that will do a far better job of keeping the carburetor cool, than that shield ever did>
This is not about insulating the carburetor, the plate has nothing to do with that. The exhaust gasses will be there either way, with or without the plate.
It's important to note that when I removed the original plate, there was NO carbon buildup on the underside of the manifold, NONE. This alone proves (to me at least) that the plate served its intended purpose. Yes, there was sludge on top of the plate, this was a high mileage engine, and the engine was full of sludge, but no coke buildup under the manifold that was protected by the plate. I have thoroughly cleaned the exhaust passage in the intake manifold, and I have a fully functioning heat riser and choke pull off, so it is all to stock specs.
For those that have an interest, here's a picture of the plate I just fabbed up.
![DSC_3723[1].JPG](https://www.forabodiesonly.com/mopar/attachments/dsc_3723-1-jpg.1715770655/ "DSC_3723[1].JPG")
Rusty et al,
As I mentioned when I started the part wanted ad, I recognize that not all agree on the need for the shield (plate), and I don't want to turn this into a debate, but I will respond to your suggestions as follows:
<There are plenty of heat paints on the market that would do just as good if not better job of that piece of metal. Red Glyptal comes to mind. It also has fantastic oil drain properties that aids in oil runoff>
Glyptal is good stuff, proven to facilitate oil runoff from rough engine castings, I agree. In this application however, I fail to see how Glyptal or any other "paint" would have the heat insulating ability created by the air gap between the plate and the underside of the manifold exhaust passage. Exhaust gas temps get into the 500 degree range, and conventional oil will flash burn at those temps, turning into coke on the underside of the manifold.
<There are tons of modern carburetor insulator gaskets that will do a far better job of keeping the carburetor cool, than that shield ever did>
This is not about insulating the carburetor, the plate has nothing to do with that. The exhaust gasses will be there either way, with or without the plate.
It's important to note that when I removed the original plate, there was NO carbon buildup on the underside of the manifold, NONE. This alone proves (to me at least) that the plate served its intended purpose. Yes, there was sludge on top of the plate, this was a high mileage engine, and the engine was full of sludge, but no coke buildup under the manifold that was protected by the plate. I have thoroughly cleaned the exhaust passage in the intake manifold, and I have a fully functioning heat riser and choke pull off, so it is all to stock specs.
For those that have an interest, here's a picture of the plate I just fabbed up.
