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Originally Posted by 767Jockey
So if I understand correctly, it's essentially the same as the 4 bolt main block, but with two bolt mains?
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Pretty much so, as pointed out they share the same casting numbers on some blocks. Now this is for a standard Cleveland block..there was mention of the XE block which is beefier all around, but regular production ones are even cast for the 4 bolt caps. The difference is, of course, the machining for the extra bolts. Any of the 2 bolt Cleveland blocks I have seen could be converted if someone needed to, in most cases it is unneccesary.