Our dear forum member, Weapon has written a simple and comprehensive guide on how to create your own 120mm heatcore. If you are looking for DIY solutions, make sure you check out what he has written.

“For some time, I have been using 1971 Caprice heatercores when I wanted to use 2-4 120mm fans for some serious cooling power. The problems with that core (barbed fittings that are a royal pain to get out and odd shaped holes punched into the top tank) led me to search for a different core.”