Alloy Heads

Hi.
What really is the advantage of alloy heads in comparison to cast iron. All the old petrol and diesel motors seldom had head issues , even after the ocassional overheat. Alloys lighter, but it cracks , warps, corrodes easier than cast. Ford falcon cars have had head issues since they changed to alloy heads way back in the early 1980s. All the early pommy tractors , David brown, fergies, fordson etc complety wore out before any head issue, as did alot of other motors. Its bugged me a bit since owning a e2200 mazda with the R2 motor ,the alloy head came off that heap off crap three times in as many years. Hope the landyis better.

Cheers Axle