As a side note, all of the head bolts for the SR20 engines are all the same except the GTi-R bolts. They all have the same part number. So that answers one of your questions dwlf89. No the regular SR20DET bolts are not an upgrade. They are the same. (The GTi-R head bolts are 12mm in diameter where all the rest are 11mm. Don't even think about using the GTi-R head bolts on another block for that reason.)
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Thanks for the clarification. (I wondered what was special about the GTi-R bolts)