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Thread: need some advice.

  1. #1
    Senior Member RACING JUNKIE
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    need some advice.

    ok.. got a question? can i run the valve cover breathers to the bottom of my air cleaner like the old chevy use to use and use the carb vacuum or do i need to run a vacuum pump or down to the header collector.... just wanna seal up the rings and dont have the money for a pump right now. just need to know if anyone has tried it and if it will work?
    GOOD PARTS AREN'T CHEAP AND CHEAP PARTS ARE NEVER GOOD.........
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  2. #2
    Senior Member SENIOR BUILDER
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    Running the breather hoses to the air cleaner will do nothing. The factory did that for two reasons. One, to make sure any air drawn into the crankcase was filtered, and any blowby that the pcv could not ingest would be ingested by the motor at the entry to the carb. In a performance or race application, it's basically useless. If you need to pull a slight vacuum in the crankcase to help with ring seal, make sure you have backfire valves on the headers and run the tubes from the valve covers to the collectors. If there is an exhaust system after the headers however, don't even bother as the backpressure will defeat the purpose of the vent system.

    Is this a race only or street/strip deal?
    Mark Goulette
    Owner/Driver of the Livin' the Dream dragster
    www.livinthedreamracing.com
    Speed kills, but it's better than going slow!!!!

  3. #3
    Senior Member RACING JUNKIE
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    Quote Originally Posted by coloradoracerguy
    Running the breather hoses to the air cleaner will do nothing. The factory did that for two reasons. One, to make sure any air drawn into the crankcase was filtered, and any blowby that the pcv could not ingest would be ingested by the motor at the entry to the carb. In a performance or race application, it's basically useless. If you need to pull a slight vacuum in the crankcase to help with ring seal, make sure you have backfire valves on the headers and run the tubes from the valve covers to the collectors. If there is an exhaust system after the headers however, don't even bother as the backpressure will defeat the purpose of the vent system.

    Is this a race only or street/strip deal?
    its drag only..... straight headers!
    GOOD PARTS AREN'T CHEAP AND CHEAP PARTS ARE NEVER GOOD.........
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  4. #4
    Senior Member RACING JUNKIE
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    can i tie into the intake plenum for vacuum .... i planned on using pcv fitting in the valve cover rather then the breathers i have in there now.
    GOOD PARTS AREN'T CHEAP AND CHEAP PARTS ARE NEVER GOOD.........
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  5. #5
    Senior Member EXPERT BUILDER
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    No when you open the throtle there is going to be no vacuum. When at an idle i doubt that you have very much vacuum. The best way is with the crank case evac system its only about 35.00 and little welding and hook up hoses to valve covers and your done. I run them before and they work pretty good, hope this helps.

    Good luck


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