Vortec Big-Block in a 1996 Chevy Truck - Head Games, Part 1 Photo Gallery
5.Wouldn't you know it? The rear gasket on the right head was slightly leaking coolant. The rear cylinder was steaming off the water, allowing the calcium to build up on that side. This is what allowed the coagulation of calcium on the back water jacket, which made the engine run hotter on that side.