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Not to burst your bubble, but only the 806 heads(97-98) had the notch and require a special gasket. the 853,241,243 heads do NOT. Unless, there was a change mid year to the castings... Anyone else want to chime in?
That's not true , 853's have the notch as well and they came on the 1999 and some early 2000 LS1 's .