Weird thing in the MotoRad 206-180 Box

So I am curious what is different about this gasket
My engine: 67 273 2bbl.

  1. The intake has pitting on the thermostat housing mating surface.
  2. I bought a OEM style repo stock t stat housing
  3. I cleaned out the holes
  4. I put the Real Gasket on per their instructions
  5. Torqued it to their instruction
  6. 16lb cap
  7. Not a drop in 5+ years.
  8. Plus it is reusable
  9. $11.00 vs $65.00
I have never had a car not leak at the t sat housing after a year.