Stock head bolts will hold 300psi of boost and I use a different lube on assembly now. Stock head bolt torque is 165 lb/ft with arp lube. The stuff I use achieves the same stretch at 15 percent less torque and these are torqued to 165 again. The completely stock bottom end will hold 1500hp at 5500rpm. With the ATI super damper, you could possibly see 6000. This motor was designed and built to run the turbos I mentioned at 900 plus hp as a daily driver/tow rig/occasional drag truck. I even have the perfect set of triples spec'd out of anyone is interested. A lot of time and thought went into the setup of this motor!