A mechanic told me that there isn't going to be anywhere for this line to hook up on my new setup. I have a Holley 600 VS and an Edelbrock Performer #2101 on an L69. He said I'd have to drill a hole in the intake manifold. Is this true? Or is there a way to do it with a vacuum can(I don't know anything about vacuum cans)?

 

What kind of intake do you have? If you have a performer intake, theres a threaded hole in one of the runners, which yo ucan thread a fitting into with a hose barb on it, and run a line to the booster.

 

That's what I was thinking, but on the current intake manifold, there's a similar hole in the same runner and there's something else hooked up to that. If I'm not mistaken, on the stock L69 setup, the brake booster runs into the back of the Q-Jet at the base of the carb.

 

Yea, theres a metal line that goes to the PB booster, which threads into a hole in the back of the carb. In your L69 intake, is there just a fitting threaded into that hole in the intake, with like 3 or 4 separate vacuum ports on it? I had the same fitting on my stock LG4 intake. You can unscrew that, re-route the vacuum lines that go to it somewhere else, then get a fitting which threads into that hole, and has a hose barb for the size vacuum host you need to go the the power brake booster. Lowe's or Home Depot should have the fitting you need, but you might want to take the old fitting up there, as well as the vacuum hose from the power brake booster, to make sure you get the right sizes for both the threads and the hose.

BTW, a vacuum canister is just an airtight tank with a vacuum line going to it. It works the same was as say an air compressor tank, only in the opposite. The vacuum line going to it will pull a vacuum inside the tank, the same way an air compressor will compress air into a tank. Then when your engine suddenly produces less vacuum, like when you open up the throttle really quickly, the vacuum inside the tank will actually 'pull vacuum' on the engine. It will only do this until the pressure is equalized though, which will take longer the bigger the tank is. Just like when an air compressor shuts off, you can still operate air tools off the pressure inside the tank, but only until its equalized with the outside pressure (tank is 'empty'). All it really does is hold 'extra' vacuum until its needed.

 

Hehe, it's been so cold out here that I haven't been able to look at it for a while. The thing threaded into it now I don't think was really hooked to anything. I'm working on removing all the emissions stuff. There's a big vacuum port in the back passenger side of the carb, but I was told to run the PCV to that. Then there's two smaller ports on the carb, ones for the vacuum advance, and I guess the other one will just be open. What other vacuum lines are there besides PCV, brake booster, and vacuum advance?

 

Well, without any emissions stuff, thats it. I assume you're gonna ditch the computer since it won't work with a holley carb, but if you were using it, you'd need a vacuum line going to the MAP (i think its the MAP :P ) sensor on the firewall. The other things that would need it would be the Cruise Control, EGR valve, Charcoal Canister, Stock air cleaner, and the climate controls. Im assuming you'll want to keep the climate controls :P, so you'll need to hook up a vacuum line to that. Its not very important where that goes, you can use a T or a Y fitting to share a vacuum port with something else for that. It should be a hard plastic vacuum line coming out of the firewall close to the heater box, then going over towards the drivers side into a cylinder looking thing mounted on the firewall. then, there should be another hose fitting on thay cylinder thing, which is where the vacuum line from the engine goes.