The Stovebolt Site Forums The Shop Area Driveline Chevy 235 vacuum for disc brakes

I'm making a swap from the old huck brakes to 4-wheel discs and a modern booster master cylinder setup from Hollister Road. My engine is a 235 with a stock manifold and Carter YF carb from a early 70's Ford 300 c.i. As far as vacuum goes, I had already done away with vacuum wipers and have electric wipers. So I have no vacuum lines except for the distributor. Will the 235 make enough vacuum for the new master cylinder and do I tee into the line for the distributor for vacuum?

Use the manifold vacuum port where the wiper tube used to be.

Use a 3/8" diameter vacuum hose to the booster, and install a vacuum reservoir if possible. I like to make the reservoir from a piece of 3" PVC plastic pipe about 18" long with caps glued onto both ends. It will fit nicely inside the frame rail under the cab, and if you paint it black it almost disappears. Use a T fitting threaded into one end cap and a one-way check valve between the reservoir and the intake manifold to prevent vacuum loss on a long uphill grade, etc. This also works to prevent vacuum wipers from slowing down or stopping when vacuum is low.
Jerry

Thanks Jerry