1 SET IC789.100/1 SET 4250BD8.100

This is a United Engine & Machine Co. (UEM) ICON Series piston ring kit or set of pistons, MPN IC789KTD.100, designed for Big Block Chevrolet (BBC) engines. The ".100" in the part number signifies that these components are for a .100 inch overbore application, indicating use in a modified engine block that has been machined beyond its original factory bore. Fitment relies on specific engine internal dimensions such as bore (e.g., 4.350") and dome volume (e.g., 20cc), rather than direct stock vehicle specifications. This part is ideal for performance and aftermarket engine builds requiring precision-engineered components for increased displacement and power.