Chevy 454 PCV and Vacuum question - Hot Rod Forum : Hotrodders Bulletin Board
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Old 10-29-2003, 05:55 PM
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Chevy 454 PCV and Vacuum question

I have a 68 RS Camaro w/ a 454 and 795cfm edelbrock q-jet. I seem to be having a vacuum problem. I am afraid I don't have a vacuum tester so I don't know how much vacuum I am pulling off my intake manifold. Here is my setup.

Vacuum attached from bottom/back of carb to brake booster
Vacuum attached from intake manifold to RS vacuum reservoir.

My problems are these:
My headlights open slow and don't seem to have enough vacuum to overcome the springs to close them

My brakes work but are not as easy to use as I would think with a 10" booster. I have trouble hitting the brakes hard enough to lock them up.

I feel I am not getting enough vacuum and this is my problem. My cam is oversized racing cam but I don't know the numbers I didn't put it in. I have heard this can cause vacuum problems.

I also have no PCV and have vented both valve covers. Does this cause a problem? I have a PCV valve for my valve covers, problem is that it has a very large hose fitting which is too big to attach to my carb.

Anyone have any suggestions or thoughts? Should I get a vacuum pump? Install PCV?

Thanks
Rick
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Old 10-29-2003, 06:18 PM
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i have a 68 rs with a zz502 init with the fact issue holley vac. 850, on my car we have the manifold hooked up to the booster then the back of the carb going to the PCV, i dont have my hideaways hooked up its not alot of trouble to open them when i need them, i hope it helps ya
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Old 10-29-2003, 06:36 PM
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The first thing you should buy is a vacuum gauge, maybe the carb is not tuned in correctly.
Crank case pressure is a totally different subject from engine vacuum.
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Old 10-29-2003, 06:53 PM
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Headlights

Hookup of the RS headlight doors wasn't too hard. Once I did one of them the other was easy. They are new doors with a new hose kit.

I am also thinking that my vacuum line from my manifold to the RS vacuum reservoir is too small. I didn't have the larger lines so I used the regular small ones. Maybe I am just using a line that is too small. I have no problem with them openeing other than they are slow. They just won't close except by hand with the engine off.

Also, any hints on how to take the headlight switch out? I have a new one but I can't figure out how to get the stupid knob out of the thing so I can remove the switch.

Rick
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Old 10-29-2003, 07:20 PM
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Wish I could find a picture of the headlight switch because it would be a little easier to explain. Anyway, there is a small plunger on the side of the switch that needs to be released to allow the knob and shaft to pull completely out as a unit.

1. Disconect battery.
2. Turn headlights to ON position.
3. Push latch button on side of switch inward.
4. Pull out switch knob from assembly.
5. Unscrew bushing from switch that holds it to dash.
6. Pull away wiring harness from switch.

Reverse the proceedure when you put the new switch in. All you should have to do is push the knob assembly into the switch without messing with the latch.

And I would probably run nothing smaller than a 3/8" vacuum hose from the reserve tank, and check your connections because it doesn't take much of a leak to ruin good vacuum.
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Old 10-29-2003, 07:32 PM
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I am going to try to do it today if I can get outa the office. That and my wife wants me to take her shopping.

Never enough time in a day.
Rick
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Old 10-29-2003, 08:16 PM
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The button is usually on the top of the switch as its mounted in the dash.

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Old 10-29-2003, 08:33 PM
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I have a 73 454 with a 272 cam and headers and the rest of the engine is stock and I am pulling 18 inches of vacume at idle and my brakes, headlights all work perfect. Make sure your PCV is new and insure there is no vacume leaks.
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