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- #21
58010 is the cracked head. I can't seem to find anything about the other number. The 58010 has deeper valve seats and a bigger relief between valves.Looks like 3B head and the number ending with 58010 may indicate something around 82-83. Some people said that internal cooling passage may be different.
It is compatible.
If this one have no cracks, I would say it is definitely better IMHO.
With cracks, if you drive around town, it may be ok. If you plan a long road trip,well not so good.
A head shop can change the valve seat, they are in cast iron. (Not available from Toyota)