68 RS headlight vacumm port on carb? - Team Camaro Tech
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post #1 of 5 (permalink) Old Apr 11th, 01, 06:50 AM Thread Starter
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Join Date: Apr 2001
Location: Newark, Ohio
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I own a nice 68 Rs and have been having trouble with the headlights not opening. The vacumm is being drown off of the carb on the bottom front port. And my vacumm advance is on the passenger side top port. Last night I checked the timing of the car and realized it was about 14 degrees retarded and I set it to 8 degrees BTDC. The vacumm on the carb port for the lights seem to be 10 times stronger. I didn't check the headlights but will this make them work easier. I guess my question is: does timing effect the vacumm for the headlights too? When I disconnect the headlight port the cars seems to reva lot higher. Any comments would be great. Thanks, Erik
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post #2 of 5 (permalink) Old Apr 11th, 01, 07:51 AM
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You have the vacuum plugged into the wrong place. Should be full manifold vacuum off the intake. This will make a big difference for you.

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post #3 of 5 (permalink) Old Apr 11th, 01, 09:34 AM Thread Starter
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Which vacuum should be manifold vacumm, the distributor or the headlight vacuum? I am planning on changing the distributor to an MSD and I will only have mechanical advance. So I will plug the port on the carb, but what about the headlight port?
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post #4 of 5 (permalink) Old Apr 11th, 01, 09:53 AM
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You should have a fitting on the back of your manifold that has several vacuum ports. It could be feeding your break booster or auto tranny etc. Be sure you have the check valves in line for the light doors so the vacuum doesn't bleed off when you stop the engine...

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post #5 of 5 (permalink) Old Apr 11th, 01, 06:26 PM
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If this is a street driven car,you should use a vaccum advance.The vac. advance will give you some extra gas mileage.

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