Gary, the 4-cylinder specas are just there for filler. I know there are several types of engines, but I don't know if we'll ever have enough info for more than one article. The 6-cylinder model in the specs appears to be about the only one that had any significant prodution, so we may not find specs for the others, but if we do, good. They did all use the same cylinders, as far as I can tell from what I've found. There really isn't much on the series available, so if we only have one decent article, that is more that most sources have! Thansk for your help, it is much appreciated. I do have some info from Gunston and a few other sources that describe the gearing and other features of the engines, but I don't understand most of it. I'll try to copy it here this week or neext, adn see if your or some of the others can "interpret" it! -