I have now installed a Grizzly 700 Clutch Cam Plate in my Grizzly 660. I completed this several weeks ago, but just put the first ride on it last weekend. So this is the update as promised from a previous thread I had going about poor gas mileage.

Since my last thread about poor gas mileage I have replaced my OEM secondary spring with a Dalton Red Spring (195 lbs @ 3", 312 lbs @ 1.75"). I have also installed a 2.0 mm shim (1.96mm measured on vernier caliper. I made the shim at home). But most importantly for this thread is the addition of the 700 cam plate.
The 700 cam plate has the exact same splines, size, fitment and angles as the 660 cam plate. The 700 cam plate just uses much, much better sliders that do not wear out. While I have found no performance increase with the 700 cam plate, there is absolutely no deficit either. But in my opinion the better slider design makes it a worthwhile upgrade to the 660 clutching. Additionally, the 700 cam plate with 4 new sliders (~$50) was still cheaper than a 660 cam plate alone (~$80) at my local dealer.

So for anyone Google’ing this or reading this on the future, the 700 cam plate is a bolt on part to the 660. It works perfect. I hope this helps someone that wants to find the answer to this question.