PDR Diesel Inc. The turbo diesel performance specialists!

Here is a picture showing the proper locations to grind when porting a cylinder head on a Cummins diesel engine. Although this is a 12 V head, the theory applies to both 12 and 24 Valve heads. As you can see, this will open up the port so it has the same dimensions throughout its entire length. This results in increased air flow for lower EGT's. We combine this with a high performance three angle valve grind. The heads are then flowed on a Super Flow bench, insuring all cylinders are matched.

We can do the entire job here or we can send you out a prepped head on an exchange basis for you do-it-yourselfer's. A core charge will apply.