The only things I can think of is power brakes, PCV, and vacuum advance. I dont have A/C, but plan to in the future so is vacuum important for that? educate me guys!! Thanks.

 

Some manual automatics use engine vacuum. I dont think thirdgens do, but the early ones (82-83) might have, someone educate me on this one too.

 

Eng vacuum works quite well at getting air/fuel into the eng.

You need vacuum for the items you mentioned plus possibly some emission equip if installed.

The water control (heater) valve I believe is vac controlled if installed on your car.

Some older trannys (Turbo-400 for sure) need eng vac.

Cruise control on at least my car (82-Z).
Not sure abt the later models.

Some cars use it to lower folding headlights.

The heater-A/C controls use vacuum to direct air flow from defroster to floor and A/C vents if avaliable. Without the vacuum, the flapper doors are spring-loaded to their default position and direct air to the defroster ducts all the time.

Not real sure I understand the point of the question.
Are you planning a big cam?

 

I was just wondering If I could run a xe268 cam in a 350 and have enough vacuum for all that stuff. I guess that should have been my real question, but I was also wondering what vacuum was even used for. thanks for the replys

 

That cam in a properly tuned carbed 350 should give you plenty of vacuum for everything.

 

i agree with rb... if all else fails just get a vac canister for your brakes.. shouldnt need 1 tho..

 

don't forget the coal canister (LOL, probably not important to you though).

 

Thanks guys

 

man I ripped that thing out as soon as i got the car