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Junior Member
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11 Posts
Discussion Starter #1
I picked up a 1MM out of a 2000 western star am told it dropped a valve my ? is should I keep it and build it or sell and find a 6NZ what I was origanaly looking for its going into a 1986 ex hood 359 also I was told that only difference from a 7cz and a 1mm is the newer block could a guy just get a 6nz block that is lighter and better for leaks and swap the internals thanks
 

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Junior Member
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168 Posts
Keep the block and have the counterbores all done regardless if theyre bad or not. The 1mm/2ws block is the strongest of them all and have way beefier main bearing caps and everything. That was quite a find. Their was many 1MM's built compared to the 7CZ.
 

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Junior Member
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11 Posts
Discussion Starter #3
thanks Cat Attack we will see whats all going on when we take apart it does have coolant in the oil thats as far as I have looked into it I am not a mechanic going to have someone do it
 
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