[fliprayzin240sx]

220 is too hot. Anything over 215 and I'd be worried. Check the torque on the ARP studs, might have loosen some if you've never checked them before after you initially put them on. You're supposed to check them atleast once after you've run the engine.

If it is the HG, honestly, fresh stock HG is good. I've seen folks push 600 hp on stock HG before they start blowing them. And reason they blew wasnt due to shitty HG, but the head started lifting.