Can I use the HT4 with the FC8 to raise the heat pipes above some motherboard components?

If you have the V3 (Alpha) version of the case, you can use the HT4 in combination with the SH2 heat pipes but it will limit the space available for 3.5″ drives. Depending on CPU location, it might still be possible to install a 3.5″ drive, but it’s not recommended.