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I have just started reading your thread and have had many ls1's. Great engine and very reliable. However, placing the radiator in the back is a problem. Idle in the garage lets the fans do thier job. Going down the road, the outside air will actually start pulling the air away from the fans. Believe me. I had the same situation when i removed the original belt fan and installed electric fans. I know you think it doesnt relate to what you have but i have seen other ls porsche conversions with the radiator in front which was better not only for cross flow but the added lenght of hose helped immensely. They have turbos mounted in the rear of front engine mount cars and the added length of hose going back to the engine even did away with a subcooler. something to think about. try driving till the temps go up at different speeds for varied amounts of times and stop. Watch the temp fo down. Logic would make you think that after driving and then stopping they would keep climbing. I think they will go down. let me know what happens. You have the best of both worlds, with your conversion. Good luck!g\
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