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i checked the casting number on my heads, i had them made for 72cc, 2.02/1.60, with screw in studs and guide plates with bronze guides. they were on my 357 until the supposed ".500" lift springs fell apart. is there a notorious problem with these heads? i noticed there was a helicoil in two spark plug holes and a rewelded area on the head where it looks like it was once cracked. anyway any info on these is appreciated.
 

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The problem with these heads are they are 305 heads and are rather thin casted. I would never put 2.02 valves in them or open the chambers up to 72cc`s out of fear they would likely crack.
When the chambers are deshrouded it creates a thinner section from the chamber to the water jacket, and if the head has been milled any it makes it even thinner and the head will crack.
 
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