Max Compression With Felpro Gaskets??

Your not supposed to use ANY silicone on head gaskets...but on copper you need a sealer around the water jackets. I've tried Copper Coat but in high load builds the head moves way too much and breaks the seal and leads to water in the oil.
The grey permatex holds very well. I've got a few engines out there running for 3 years with no tear downs and no leaks. I've found the grey allows movement without breaking the seal.
This is on SCE's Titan ICS gasket.