I have a stock drum disk one now and I will be putting ls1 calipers. I see Ed has a up grade spring for 91 92 cars but not my 87. If I get the 1le PV will it work if I upgrade to 14 inch 6 pistions z06 calipers. If not I sould just get a wilwood one for 70 bucks and call it a day.

 

I'd say get the adjustable valve anyway. Even with the "correct" spring you still won't get all the brakes have to give and if you change again you'd probably have to re-adjust the pv too. I got the Summit one for about 40 odd bucks and $25 for the re-flare on the lines and a little bending and it makes a huge difference. Even with stock drums it would be a good think to have.

 

Man it was 1am when I wrote this I was so sleepy, yeas I think about my car b4 I go 2 sleep.

I was thinking that, I like the OE look but for less money I can get more I will go for that. The bends in the line after the proportioning valve means something.