Ok, I am ready to replace my head gasket.

What do I need and where to get it ?

Do I have to get a .10 or a .20 ?

Truck is a 1997 2500 4x4 auto "project" I recently purchased, it will get 370 injectors and a fuel plate but that's it, nothing else extra, since it will be a towing and work truck.

 

I think you have to find out how much the head needs to be milled before you buy the gasket. That way you keep your compression as close to stock as possible.

 

For what I am reading there are only 2 thicknesses available, .10 and .20

The later is used where you have to lower compression to install large turbos and have more air/fuel volume

 

Take the head to a machine shop , have tested for cracks and warpage , if beyound spec. have surfaced , then the shop will measure head and be able to tell you witch gasget to use , then get it from Cummins .

 

There are three gaskets availabe, stock thickness, .010 over, .020 over, all marine type. You could just do like some and just get a .020 and hope its flat. Many have done so without any problems.