> The alloy that the new AMC heads that I
> sell are made of is different than the original heads and is supposed to not
> have the corrosion problem as well.

        Hrmm. I bought my van with a set of AMC heads on it. I pulled
them when I noticed white crust building up of the junction of the
rubber gasket and the head. Sure enough, the heads were pitted...
I don't know how many miles those heads had on them or for how long
the heads were on the van (in terms of time), but they did suffer from
crevice corrosion under the head gasket...

dave