Another item purchased from S&P was their EGR block-off plate and bolts.
My understanding is 6.1’s do not have EGR and figured I will not need the block-off plate. But I see a gaping hole on the right side head and figured be safe than sorry.
You just need to make your own gasket (which I added some copper RTV to) and bolts right on.

3930582-EGRblockoff.jpg (1726 downloads)