Flame brazed aluminium block for connecting tubes in automotive heat exchangers and/or turbocharged air coolers and/or automatic transmission coolers: -with extruded, bent connection tubes with an outer diameter of 5 mm or more, but not more than 25 mm, -with a weight of 0,02 kg or more, but not more than 0,25 kg, for use in the manufacture of cooling system in vehicles of Chapter 87