3.8 block ??

AFAIK, SC heads use larger head bolts and different gaskets.

According to Fel-Pro, the SC uses different bolts by part number from a 3.8 NA, as an example. SC Fel-Pro head bolts ES72131 are 11mm; NA v-6 Fel-Pro ES72174 are 10.5mm

The gaskets have to do with the coolant flow, SC vs. NA.
 
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