**600hp sbm block limit? Or is it bs!!**

What head gaskets are you guys using with the turbos? Any problems with blowing them out? Not much clamping force at that level without the extra head bolts that the aftermarket blocks have.
I used Cometic MLS sprayed with copper coat & used ARP Studs. I also torqued the heads another 20 pounds. Up till now it has still not popped a head gasket & this engine is seasoned.