aluminum vs. cast iron heads

In my case I wish I had bought aluminum heads to start with. I took a set of J heads (SB) had them opened up for larger valves, hardened seats, bronze guides, new springs, valves, keepers and when i got done a little more could have had the aluminum.

Then I kept having valve train problems so they were done again, now I have more than cost of aluminum in a set of old iron heads

Buy the best to start and don't look back