3.1L junk heads 2003 grad prix

[butchfig8]

2003 grad prix 3.1L J code one head has burnt valve
what is the difference between 1999 3.1L head and 2000 - 2003 heads ??

 

[Jevik]

The 00-03 3100 heads have better flow characteristics than the 99's.

Other than that they're about the same. If you do get the 99 head, get both. Having one side of the engine flow better than the other isn't a good idea.

 

[butchfig8]

Thanks for the info
3.1L will the whole 99 motor fit the 2003 if one uses the 2003 intake ??

 

[Jevik]

Might have to use your fuel rail and egr, but there shouldn't be any issues