440 Source Head Opinions?

Let me put it this way since you guys can't comprehend it. You're losing more time off your et with the weight savings vs the power gain these heads are giving over stock. What are we talking 10hp? SMH Has anyone given dyno proof of the power gains from just a bolt on nothing changed good stock heads and then bolt an untouched stealth heads on? I doubt it, most people change cam and intake and port the stealth heads and then claim all this big power gains.