In the mid to late 80's, we did all the upkeep for a local phone company's fleet of vans. Their engines all used the integral head. Never really noticed if there was more than one style though. They were,unfortunately, always cracked and broken and had to be replaced with the vans only having 50k-60k miles on them! Even used ones out of a junkyard were also bad and unuseable.Mostly cracked in the exhaust seat area bad enough to actually leak water into the cylinders, and on the outside in the area resembling the exhaust manifold. I would check yours out thouroughly before using....
