I have John's Dual Master Cylinder setup with Arizona Z's 4 caliper wilwoods all the way around and no brake booster. I currently have (two) 3/4" Tilton Masters on it. We took it out for the first real drive the other day with the LS1. It took gorilla legs to stop it! It stops, but you had to REALLY push REALLY hard. I talked to both John and Dave about my set up and I was told to go to (two) 5/8" (Dave) or 11/16" (John) master cylinders. So back to the drawing board... On a side note, WOW!! The V8 is so nice!!!! Sorry, still smiling.