RPM (provided for in subheading 8406.82.10) Free No change No change On or before 12/31/2020 . 1421. Used compression-ignition internal combustion engines Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.15.41 Used compression-ignition internal combustion piston engines to be installed in vehicles of subheading 8701.20 or heading 8704 (provided for in subheading 8408.20.20) 1.5% No change No change On or before 12/31/2020 . 1422. Engine blocks Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.15.42 Engine blocks, each weighting over 272 kg but not over 317 kg, for compression-ignition internal combustion piston engines (diesel or semi-diesel engines) having a cylinder capacity of approximately 12.4 liters for vehicles of subheading 8701.20 (provided for in subheading 8409.99.91) 1.1% No change No change On or before 12/31/2020 . 1423. High silicon molybdenum exhaust manifolds Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.15.43 High silicon molybdenum exhaust manifolds for use in compression-ignition internal combustion piston engines (diesel or semi-diesel engines) with cylinder capacity of 2,300 cc or more but not exceeding 20,000 cc, each manifold measuring at least 80 cm but not exceeding 200 cm in length, at least 10 cm but not over 200 cm in width, and at least 10 cm but not exceeding 200 cm in height (provided for in subheading 8409.99.91) 2.1% No change No change On or before 12/31/2020 . 1424. Connecting rods Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.15.44 Connecting rods designed for use in compression-ignition internal combustion piston engines (diesel or semi-diesel engines) for vehicles of subheading 8701.20 or heading 8702, 8703, or 8704, each rod measuring at least 20 cm but not exceeding 120 cm in length, at least 10 cm but not exceeding 60 cm in width, and at