Subject to the general provisions regarding the classification of parts (see the General Explanatory Note to Section XVI), this heading covers parts of internal combustion piston engines of heading 84.07 or 84.08 (e.g., pistons, cylinders and cylinder blocks; cylinder heads; cylinder liners; inlet or exhaust valves; inlet or exhaust manifolds; piston rings; connecting-rods; carburettors; fuel nozzles). However, the heading excludes :(a) Injection pumps (heading 84.13). (b)Engine crank shafts and cam shafts (heading 84.83); and gear-boxes (heading 84.83). (c) Electrical ignition or starting equipment (including sparking plugs and glow plugs) (heading 85.11).
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