[Chevelle-list] Vacum

Tue Aug 14 22:11:47 MDT 2007

Thank you all for the advice, I will be probly be reaching out tomorrow after I get some parts :0) Jimmy C.
  ----- Original Message ----- 
  From: tech 
  To: The Chevelle Mailing List 
  Sent: Tuesday, August 14, 2007 11:07 PM
  Subject: Re: [Chevelle-list] Vacum

  The answer to your original question...

  Measure your manifold vacuum from the lowest point on the carburetor or anywhere in the intake manifold.  A healthy engine should read a steady needle from 15 to 22 in/Hg - subtract 1 in/Hg per every 1000 ft above sea level.  Long duration cams and late ignition timing will lower your idle vacuum too.

        Thank you,
        Don Hoeschen
        CEO/Mechanical Engineer
        Granite City Performance

                Granite City Performance
              custom engineered competition components  

  On Tue, 2007-08-14 at 21:27 -0500, Dale wrote: 
    Check the bottom of the lifter for abnormal wear with some others nearby.  It may indicate a bad lobe on the camshaft.  Personally I would not change all the lifters as they’ve already taken a seat on their respective lobes; same with pushrods, no need to replace them if they look alright.

    Dale McIntosh

    ChevelleCD.com - 1966/67 Chevelle Reference CDs

    ChevelleStuff.com

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    From:chevelle-list-bounces at chevelles.net [mailto:chevelle-list-bounces at chevelles.net] On Behalf Of Jim & Chris
    Sent: Tuesday, August 14, 2007 9:12 PM
    To: The Chevelle Mailing List
    Subject: Re: [Chevelle-list] Vacum

    I just found the problem .It seems the intake lifter on #7 must have failed causing the push rod to bend like a slight "S" and break off . so now I'm going to take the manifold off to retrieve the lifter and bottom piece of the push rod and look for damage. is there anything else I should do while I have it apart ie.change all the lifters and pusrods ? Thanks again Guy's, Jimmy C.

      ----- Original Message ----- 

      From: Rick Schaefer 

      To: The Chevelle Mailing List 

      Sent: Tuesday, August 14, 2007 9:20 PM

      Subject: Re: [Chevelle-list] Vacum

        I second the blown out header gasket theory.   At least check it before doing a lot of other work.  Its easy to check...Been there, done that, got the T-shirt.

      On 8/14/07, Jim & Chris <colgan at warwick.net> wrote: 

      oil pressure is fine, the tapping noise is comming from what seems to be driver side maybe #7. I'm going to drop the oil and look for particles. thanks, Jimmy C.

        ----- Original Message ----- 

        From: bad66chevelle454 at aol.com 

        To: chevelle-list at chevelles.net 

        Sent: Tuesday, August 14, 2007 3:18 PM

        Subject: Re: [Chevelle-list] Vacum

        How is your oil pressure? 

        I had a knock in my 454...Oil pressure was fine, so I knew it wasnt a rod knock. LONG story short, it flattened out the cam...which is notorious in BBC's from what I hear. I would check your valve lash...if one is really lose, there's your problem. It would most likely be the number 7 or 8 cylinder. 

        -----Original Message-----
        From: Jim & Chris <colgan at warwick.net>
        To: The Chevelle Mailing List < chevelle-list at chevelles.net>
        Sent: Tue, 14 Aug 2007 11:59 am
        Subject: [Chevelle-list] Vacum

        I am  finally getting back to my Chevelle , rookie question but here goes. which is the best port to measure the vacuum and what should the vacuum be ? I have a knock and its not running on all cylinders . The motor is a 454ci , with a stock rebuild with a mild cam. 915 miles after rebuild..with a few hard ones squeezed in. Thanks for any help, Jimmy C. 

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      -- 
      Rick Schaefer
      72 TPI El Camino

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