Didn't notice those, but for the price, it would be just as const effective, or more so to buy standard bolts, with the stepped washers. Six in one, half a dozen in the other I suppose?
Not necessarily true. Heat = power for certain....but heat can also equal detonation unless you're got a high enough octane content in your fuel to keep pre-ignition at bay. If not, timing needs to be pulled and down too goes the power levels as a result. Aluminum heads are more resistant to detonation, which will allow the use of more ignition timing.
I suppose if ALL things were equal, an iron head "could" produce more power. But that would only be in the case that the aluminum heads are not being utilized to their fullest potential. Aluminum heads will handle more heat, more compression and more timing than an equal iron head and will therefore make more power.