Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - ZZ383 knocking
Thread: ZZ383 knocking
View Single Post
  #2 (permalink)  
Old 06-26-2009, 02:54 PM
cobalt327's Avatar
cobalt327 cobalt327 is offline
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 60
Posts: 5,036
Wiki Edits: 1616

Thanks: 128
Thanked 598 Times in 547 Posts
Quote:
Originally Posted by fivewindowcoupe
I've traced the knock to the passenger side either the #6 or#8 cylinder. *snip* I broke the engine in as per GM's instructions but I only went to 4000 - 45000 rom instead of the 5000 rpm spec'd by GM.
I would suggest you pull the valve cover and carefully check the valve lash on the suspect valves, and readjust them just as you originally did.

If the tapping diminishes then returns yet again- there's a good chance a cam lobe is going away.

Is there a reason you didn't follow GM's instructions regarding break-in?
Reply With Quote