308 or RHS on a 408

I'm useing the RHS heads in stock trim, They have "plenty" of torque, I'll have to agree with StrokerScamp on the cracking issue, most all of those light casting magnum heads had this problem, your lucky if you get a good set, I'll listen to the machinest that get them in all the time cracked (in some fashion) around the seat area, my magnum heads were toast, so in the trash they went. I spent right around 60.00 shipping for "both" my heads, 936.00 to the door, best $$$$ i've spent.