Need a vacuum pump or canister??

[trailblazr81]

My 383 is making about 14-15" vacuum. How much do I need for the power brakes?? All I need vacuum for is the brakes, distributor advance and the TH350 tranny. If I need more, whats the easiest/cheapest way to get more??

 

[diesel4me]

should be enough..

Many worn engines only produce 15 inches of vacuum,and their power brakes still work OK..I dont know at what point they wont work satisfactorily though..I'd guess 10 inches or less?..you can add one of those "coffe cans" they used in lincolns and caddy's with lots of vacuum operated accessories to give a greater reserve of vacuum..nothing more than a storage tank basically..only in cars with extemely lumpy cams and low vacuum would a pump be nessasary I would think..

 

[trailblazr81]

My cam is 236 duration @ .050 lith 110 degree lobe seperation. I thought I read a while back that you may need a vacuum canister or pump when over 230 degrees.