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I'm having the same trouble with the cad motor..runs around 225. I have been doing a lot of research, and one thing you might try that I have read alot of people with cad motors like mine is to drill 6 very small holes in the thermostat to let air and a tad bit of coolant to circulate. This keep the engine from developing hot spots and quite a few folks on the cadillac boards have claime that it dramatically helped their cooling problems. Not sure of the science behind this, but its a cheap thing to try. I am going to try it this weekend just to see if it helps..after that I am going to check a lean condition as well. Also you can sometimes bump up the fuel pressure a tad to accomodate for a lean condition on gm based throttle body injections....
