John deere 466 head on a 4010

that head won't fit. the bore between the 404 and the 466 are diffrent. just about all the 466 heads are universal, but you can't put one on a 404.
 
I think the head will need to be externally oiled, a spacer will need to be made to cover the lifter holes as the 466 head is narrower, injectors and lines are different. Compression ratios is something else to think about.
 

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