I've heard of a few people talking about this and wandering what exactly it is and does. And can it be performed at home. And what the pros and cons are to this.

 

hmmm deffinately not something you should do at home. turning the barrels will mess with the fueling balance between the 6 cylinders. best for the pump to be balanced and left that way. theres no reason to mess with it unless you have reason to believe they've turned.

 

Def do NOT do this at home. The pump has to be removed from the truck and taken to a trusted shop with a flow bench. There is no need to do this unless your going to go for all out hp for sled pulls or racing