Good heads vs Bad heads

[sd_iconoclast]

I have a '91 EB with about 175K on it. and I am about to pull an engine form the junkyard to rebuild.
I know that the heads on these engines tend to crack. Mine both cracked at about 125K. The chinese replacement heads I bought were visibly thicker.
Were there any good (not prone to cracking) from Ford? If so, how can I identify them (or aftermarket heads) in the junkyard?

 

[1991 sploder]

In my opinion the heads aren't REALLY prone to cracking more than any other vehicles with aluminum heads... Its installing or even removing incorrect sequence then they will crack very easily... I wouldn't want the used heads even when taking them off u gotta go by the sequence and putting them on u gotta be very careful or eventually they will crack. Look for the cast iron heads being made for it. Even eBay has them

 

[1sicbronconut]

Ford 4.0L OHV heads are cast iron not aluminum and there's not a de-torqueing sequence either. From what I understand most of the aftermarket casting are cast with thicker areas where the stock Ford heads had issues. Here's a example on Ebay Ford 4.0 245cid Cylinder Head OHV Explorer, Ranger, B4000 1998 - 2000 PAIR | eBay