Valve adjustment 69 - Pontiac GTO Forum

User Tag List

LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 11-12-2012, 08:16 PM Thread Starter
Join Date: Nov 2012
Location: Paducah KY
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Valve adjustment 69

New to the forum. My new to me 67 has a 69 xh engine with 48 heads. I pulled the heads due to a blowback problem-unfortunately I don't see an obvious problem. When putting things back together and adjusting the valves I find that about half of the adjusting nuts bottom out before the tight plus 1/2 turn is complete. The car has been driven hard in it's history including a lot of drag racing. I put a new oem cam in the car. Could the valve stems have excessive wear? What about the rockers or pushrods. They appear stock.
Your wise counsel is appreciated.
Lrdurbin is offline  
Sponsored Links
post #2 of 5 (permalink) Old 11-12-2012, 09:42 PM
joesweeting's Avatar
Join Date: May 2011
Location: Virginia Beach
Posts: 256
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I had a similar issue, but just on one valve rocker bottoming out when adjusting. I had some worn parts. I don't recall what was worn/damaged since I planned on purchasing new heads. Out of curiosity, I switched some parts to change wear points and it seem to temporarly fix the problem, but I never used the heads.

Sent from my ADR6425LVW using AutoGuide.Com Free App
joesweeting is offline  
post #3 of 5 (permalink) Old 11-13-2012, 12:12 PM
Super Moderator
BearGFR's Avatar
Join Date: Aug 2008
Location: Springtown, TX
Posts: 4,968
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
If you've got stock heads, stock rockers, stock bottlneck studs, stock cam... the adjustment procedure is simple --- torque all the rocker nuts down to 20 lb.ft. They're -supposed- to bottom out.

All that changes when you start getting into aftermarket valve trains that require a fully adjustable system.


Springtown, TEXAS
BearGFR is offline  
post #4 of 5 (permalink) Old 11-13-2012, 03:03 PM Thread Starter
Join Date: Nov 2012
Location: Paducah KY
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks. I learned something
Lrdurbin is offline  
post #5 of 5 (permalink) Old 11-13-2012, 06:16 PM
64-67 Expert
geeteeohguy's Avatar
Join Date: Feb 2008
Location: Fresno, California
Posts: 7,905
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Also, use new nuts. I've had problems with re-used nuts backing off after use. Engine oil blowby is caused by worn piston rings, not valves. Worn valve guides/seals will cause oil smoke out of the tailpipe on deceleration, as in coasting down a long grade. If you have oil smoke coming from the breather cap, it's worn rings.
geeteeohguy is online now  
Sponsored Links

  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, LeMans & GTO Technical and Electrical Wiring

Quick Reply

Register Now

In order to be able to post messages on the Pontiac GTO Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Thread Thread Starter Forum Replies Last Post
66' door adjustment... Instg8ter 1964-1974 Tempest, Lemans & GTO Complete Exterior Body 8 03-14-2011 09:59 PM
2005 GTO LS2 valve adjustment? rnoswal Service, Maintenance and Technical Discussion 8 05-31-2009 08:18 AM
'06 Clutch adjustment? kegbelly Drive train, suspension, alignment and brakes. 7 05-01-2007 07:52 AM
04 GTO Audio Adjustment ThePrincipal Test Forum 3 01-03-2006 11:32 AM
headlight adjustment HoldenGTO Service, Maintenance and Technical Discussion 7 12-21-2005 07:02 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome