Are you tired of dealing with engine block issues? Look no further than the Caterpillar 3406E/C15/C15 Acert Spacer Plate. Designed specifically to reduce stress on the liner flange, this plate guarantees proper head gasket sealing and ensures correct liner protrusion. Don't risk engine damage or costly repairs - always use a new spacer plate when overhauling your engine or removing the cylinder head. Our spacer plates come in two sizes, with the standard size at .338 thickness and part number 6I4421. Invest in an inexpensive assurance that your engine will be sealed properly with the Caterpillar Spacer Plate.