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Most of buyer when look for 4M40 Cylinder head will be facing the some problems on which type of cylinder head are suitable for their truck.

From this picture we can identify the highlighted with  arrow pointing to the hole which have different dimension.  

But the most simply way to identify these 2 type of cylinder head as below : 

1. 4M40 is only for non-turbo charger 

2. 4M40-T is for turbo charger.

Isnt simply to choose from these cylinder head.