I am a new member here. I have a '70 440HP that I have had for years while working on a Challenger project. It is mounted on an engine run stand to work out all bugs before going in the car. I don't know the history on the bottom end but the heads were rebuilt to stock, I went through 6 pack carbs I acquired separately, new 6 pack grind cam, with all emphasis on stock applications, and new electronic ignition set up. I used an old radiator that I flushed out and there is no fan shroud. I started the engine yesterday and ran it about 15 minutes at 1500 RPM. Ambient temps were around 35 degrees. The exhaust manifolds became glowing red at the exit points, paint on the right valve cover turned black at the closest point to manifold, water temp hit 240 degrees, and I used about 3/4 gallon of fuel. I was having trouble with my timing light connection but am pretty sure it was around 5 degrees before TDC What would cause the exhaust and water to become so hot? Timing, poor coolant flow, extra fuel being burned in exhaust, too lean of fuel mixture?
