I heard these heads were prone to cracking between the valves.
Are they differences in casting thickness between various years , so I should look heads from certain years or are they all the same?
Yes, cracking between the valves is a problem. There are a few differant casting numbers but I dont think one is less prone to cracking then the others. I do think one casting flows a little better.
There is a company that is casting new upgraded Magnum heads also. I'll see if I can find the nfo on them.
