GM 6.2 Liter V-8 Diesel Engine Cylinder Heads: (4) Cylinder head cores, one of the cylinders does not have valves. The numbers cast onto the cylinder heads are: 1.) GM13; 2.) GM11 J216; 3.) GM3 G255; 4.) GN9 L036. Selling the (4) cylinder heads for $120., no haggle price. I am not interested in selling the cylinder heads seperately. Call (760)746-