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I forget if it was here or on ls1tech. But ive read that the 160 t-stat is actually worse somehow for our engines. Going with the 180 will be better. But I could be wrong ill try to find the thread
my tuner said he got more power out of LS engines with a 160 t-stat, by 10hp or something like that. i dont know why or how but thats what he said so i have one now