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 <http://www.chevellecd.com> ChevelleCD.com - 1966/67 Chevelle Reference CDs ChevelleStuff.com <http://www.chevellestuff.com> <http://www.chevellecd.com> _____ 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 <mailto:[EMAIL PROTECTED]> To: The <mailto:[email protected]> 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] <mailto:[EMAIL PROTECTED]> To: [email protected] <mailto:[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. _____ AOL now offers free email to everyone. Find out more about what's free from AOL at <http://www.aol.com/?ncid=AOLAOF00020000000437> AOL.com . -- Rick Schaefer 72 TPI El Camino _____ avast! Antivirus <http://www.avast.com> : Outbound message clean. Virus Database (VPS): 000765-1, 08/13/2007 Tested on: 8/14/2007 9:26:24 PM avast! - copyright (c) 1988-2007 ALWIL Software.
