engine blocks used for the Cummins, Caterpillar, Toyota etc. Cylinder blocks for follow: Cummins: 6ct one thermostartor, ... : 488Cummins (cylinder blocks, cylinder heads): 6ct, 6bt, 6bta, 6btaa, 4bt. ()Caterpillar: 3208,3304 pc, 3306 pc, 3306 di, 3408,769b (engine 9m3677 ... teams to design and measure the cylinder heads, blocks completed engines. Than is why we develop the cylinder heads more than ...