I've had 2 sets cleaned, both entered within a few percent and left within 1-2cc/min of each other. Stock LT1 injectors generally get turned away. Apparently the colied wire that forms the electromagnet to open the pintle has insulation that gets washed away not only by fuel over time, but also more aggressively by the compounds they use to clean the injectors. One of the reasons stock LT1 injectors blow. There are certain LS injectors that play nice, but you really need to do your homework.