While we are on the subject of cooling, what causes a motor temp to rise when you turn off the engine? As an example, my Son Dan has a 455 Olds in his rpu and if it is running at 200 for example when he shuts it off to get gas or something, the temp gauge goes to 230 or 240 in a few minutes. I know there is something called heat soak, but I always equated that to a component like a starter absorbing heat from the headers or block.

I know that Olds has a lot of cast iron in it, but the sbf in my roadster will start cooling down the moment I shut it off. If it sits there for 15 minutes the temp will have dropped maybe 20 degrees.

Just puzzled by what is going on with his engine.

Don