With LS1 disks all around, what master and prop valve should be used? I've searched and some say 1LE prop valve with stock master, but I'd just like to see what everyone else says. Thanks.

 

of the available prop valves, the 1le valve would be best.

using a adjustable valve would probably be a little better than that and will allow you to tune the brakes for maximum performance and proper bias based on the car and driving style.

 

Ok so after reading the adjustable proportioning valve install tech article here I've decided that's the way to go. However, every adjustable prop valve I find has 1/8th" inlet and outlets yet our rear lines are 1/4" (I checked this morning). So how do I install it when the lines are too big? Cutting/flaring is no big deal, but I can't see how this works.

Here's the tech article:

https://www.thirdgen.org/propvalve

Here's an adjusting prop valve:

http://www.summitracing.com/parts/SUM-G3905/