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What are the differences in the 506 vs. the 599?
Is there any reason why i couldn't put a 599 into a 98 GMC 3500 that had a 506 from factory.Both are f series as far as i know. This is just the beginning of what i think is going to be a very interesting project.It's been down over a year i think it's about time to do something,even if it's wrong. Going to pick up motor tonight.Will know for sure then what i have.
 

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The only external difference is the location of the oil tap for the OPS.
 
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