What, exactly, is an "005" headgasket?

mopar performance part # 4452005

It's part of the part number. It's the MP 4452005 head gasket (Mopar Performance). It's actually called the non-cross drilled hg, but it has the holes for cross drilling, and it has bigger coolant holes.

The MP 4452006 is the one meant for cross drilled block, but I would run the 005 no matter what head/block you have.

Sweet. Im putting a G-head on my 2.5L mini, so I guess the 005 is what I need! THANX!

The 006 has smaller holes elsewhere to push more coolant through the x-drills.

then why does the 005 have x-drills?