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I had this idea the moment I bought the Revell USA snap kits, Kenworth W900 and Peterbilt 359. They share the same engines but I knew they would look different after I build them. But that required a little bit of study on my side since I don´t work in the field and never had a chance to explore these engines by myself. Here I want to thank all the guys who answered my questions in the Truck Stop section of the forum. With their help I was able to build two versions of Caterpillar 3406 engines. This yellow engine is pretty much the box version with only a slight modifications and a few details added. I followed the article in CM magazine by Ken Smith... http://public.fotki.com/modeltrucks25thscale/model_magazine_articles/car_modeller/cm08_july_1991_cate/cm_1991_07_jul_01.html Can´t be thankfull enough to this guy. He lead my hand on a number of projects already. This white engine is also a CAT 3406 but it´s changed a bit to represent the aftercooled B version. Some parts are modified and some are scratch-built. Like the aftercooler and lines, dip stick and valve cover breather tube. I also changed belts using a rubber line bought in craft store. Here is a couple of pics showing both engines. Note the differencies between them. The shape and location of the fuel pump, the aftercooler, the plumbing and timing governer cover in particular. More to come...