If you do check the thread with Moparofficial you will notice that it was cast iron heads not aluminum. And that they had sent him two different part numbers. But I believe in the end they did him right. Call them junk if you want to. They still make horsepower. there's still aluminum and they're good for their price. they're great for their price. The only thing you want to do is pull them apart and make sure everything is cleaned and fits correctly and then put them back together and use them.