[Chevelle-list] Vacum

[tech]

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
> 
>  
> 
>  
> 
> 
>                                    
> ______________________________________________________________________
> 
> 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. 
>                 
>                 
>                                            
>                 ______________________________________________________
>                 
>                 AOL now offers free email to everyone. Find out more
>                 about what's free from AOL at AOL.com .
>                  
>                 
>                 
>         
>         
>         
>         
>         -- 
>         Rick Schaefer
>         72 TPI El Camino
>         
> 
> 
> 
> 
> ______________________________________________________________________


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