The new rings fit very nicely in the reaction shaft on the back of the pump.

I did some measuring and it looks like if I sistered a steel under the pressure plate to make it .060 thicker then I could run 3 of the raybestos .065” stage-1 red clutches with .110 gap. I’m not doing that (!!) but if I had to drive it to work in the morning I’m thinking it’d work just fine- and might be a good way to be able to air check the piston before I get the clearance right to run the 4th fiber? With hopefully 500+ ft/lbs I’m going to get that 4th fiber in there! A machinist buddy said he could scrape 50 thou off the pressure plate nice and flat for me by tuesday. It’s up around .275” thick now. Maybe I should ask if he can machine a ledge around the edge and leave more meat in the center for heat dissipation and strength? Or am I overthinking it?

Can’t thank you all enough for the help with this 727. Next one I build will be easier!