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When was the split (build date between 04 and 04.5) 6.0s, when did 05 style cylinder heads come in, and what is the difference?
 

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built 9/23/03 and earlier is 04. Look at the passenger side valve cover. If the icp is there its a late build. Early build icp is in hp pump cover in back under turbo. Intake crosses over in back under turbo on earlier 04 and is u shaped on later. 05 style heads started with 2004.5 oil rails and Injectors are different- they are the ones that have dummy plugs.
 
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