here's what it says on the novak site.


ALWAYS USE ESC HEAT SINKS
Heat sinks are factory-installed on your HV-Maxx ESC and MUST be
used for maximum cooling and performance––Never allow separate
heat sinks to touch each other or any exposed metal or conductive
surface, as this will cause a short circuit & damage ESC.


the individual fins don't matter but if two banks of the sinks touch it's bad