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:[EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] 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 <[EMAIL PROTECTED]> 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: [EMAIL PROTECTED]
To: [email protected]
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 <[EMAIL PROTECTED]>
To: The Chevelle Mailing List < [email protected]>
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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