I don't see why you couldn't do it. It's only 0.0065" shorter. You might need to cut the head for the springs just slightly to keep the same rate. And shorten the valve guide. Other then that they should open the same amount once adjusted. Does it have hydraulic adjusters or mechanical? Call a machine shop and ask what there thought is. I'm unsure on the diesels. But it can't be much different then any other engine. Why are you looking to go with a shorter valve?