[torqhead]

Originally Posted by mbeeman400

So I got the booster, installed it and it works!! Brakes behave like a modern car. Stops well, can lock them up. Never run out of assist. So the 9" dual diaphragm from the 80-81, 4 wheel disc Firebird with some tweaking to the valve did the trick. I have a small vac canister left over when I was trying to get the 11" booster to work. It made no difference on the 11" booster. Again I only have about 10" hg of vacuum.
I had to move the MC forward about 1.5" . There was plenty of steel line so no problem there. The push rod length was made to match the 70 model. No issue with hood clearance and fender well clearance. Easy install and well worth it

Good to hear, every time you drive that car now for months to come you’re going to be liking those brakes more and more!

[Carmine]

I'm glad it worked for you. Thanks for sharing those results, Carmine.

[73ta]

I run the same cam on my 463. No vacuum issues even with ac. Idles like a stocker. Running the small booster from an 4 wheel disk TA and 4 wheel disks.

[mchell]

After using a vacuum can for years i decided to install an electric vacuum pump:

https://leedbrakes.com/i-23439165-el...it-series.html

Just finished the install today and love this thing.

Basically silent operation and my brakes are working better than I ever remember...great pedal and braking!........too cheap for a hydro boost and didn’t trust that a “dual booster” was going to work. Glad I went this route.

[TedRamAirII]

I wonder about this. Use it and a vacuum switch and relay to turn it on/off. I'll bet you can get one from a salvage yard for $20.00 https://www.summitracing.com/parts/a...xoC_cIQAvD_BwE