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You should be fine, I haven't had to turn the heat on to cool my 240sx with a ls1. As long as you have a nice shroud and fans you should be good. the iron block will make it heat soak more than a aluminum block but a lot of people with ls swaps don't run the heater cores. The only crappy part is you don't have the option to cool your engine that way if it comes to it. I feel like you will be fine as long as you bleed the cooling system well. Also get a lingenfelter 160* thermostat since the stock 190* is high and may contribute to getting too hot. I am still running the 190* one and would see around 210 on the dyno so I went into hp tuners and had the both fans turn on at 170*. I hope that helps, PM me if you need more info
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