V6 E3D Brass Heater Block for PT100, PT1000, K500. 23mm Brass is a great conductor of heat, and these blocks can often hold their heat more reliably than aluminum blocks.

Want to Print over 270C ?  Replace your Aluminium Block with one that will not get soft.

Aluminium Melts at only 660C.

Standard 23mm Sock will fit, Nozzle position is off center of block,

Socks start to burn at Over 280C