Valve tip to rocker arm alignment - Chevelle Tech
Engine AdvertisementGeneral Engine Discussion.

 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 10 (permalink) Old Jun 9th, 08, 10:44 PM Thread Starter
Lifetime Premium Member
Troy
 
Join Date: Apr 2004
Location: N.E.INDIANA
Posts: 792
Valve tip to rocker arm alignment

I was adjusting the valves on a fresh 396 tonight and noticed that all the intake rocker arms are off center, some worse than others. The exhaust all look good. I'm running Manley guide plates with 3/8 push rods and factory stamped steel rocker arms. I've done a search and have come to the conclusion that aftermarket guide plates are a crap shoot. My question is, should I be concerned since I'm just running stamped steel rocker arms? Will one side of the valve tip wear prematurely? Should I buy GM guide plates to fix the problem or am I concerned for nothing? Thanks for any guidance (pun intended).
blacknblue is online now  
Sponsored Links
Advertisement
 
post #2 of 10 (permalink) Old Jun 10th, 08, 1:54 AM
Senior Tech Team
Doug
 
Join Date: Jan 2008
Location: British Columbia, Canada
Posts: 1,474
Re: Valve tip to rocker arm alignment

You can either shift your current guideplates to average out the intake and exhaust rocker arm alignment, or I believe Dart sells adjustable guideplates.

Stamped rocker arms, esp on a BBC, need good alignment to keep them alive. That is one engine where we do our best to get the customer into full roller rockers, or at least the Comp roller tip.
rustbucket79 is offline  
post #3 of 10 (permalink) Old Jun 10th, 08, 2:41 AM
Lifetime Premium Member
Keith
 
Join Date: Sep 1998
Location: Ontario, Canada
Posts: 7,858
Re: Valve tip to rocker arm alignment

Can you still get original guide plates from GM? They used to come in 5/16", 3/8", and 7/16".
Keith Tedford is offline  
post #4 of 10 (permalink) Old Jun 10th, 08, 9:54 AM Thread Starter
Lifetime Premium Member
Troy
 
Join Date: Apr 2004
Location: N.E.INDIANA
Posts: 792
Re: Valve tip to rocker arm alignment

Doug, Thanks for your input. I never thought of elongating the mounting holes to help the problem a bit, although then they would all be off somewhat. You make it sound as though it is quite important on stamped steel rocker arms to maintain good alignment for things to last. This car will only be driven 1000-1500 miles a year and is a pretty tame unit but I hate to half a$$ anything especially when it comes to durability and longevity.

Keith, yes new GM guide plates are still available @ $6.30 ea. wholesale. Part# 3860038 for 3/8 GEN IV. Unfortunatly they come 5 to a box so you may have to buy all 10.
blacknblue is online now  
post #5 of 10 (permalink) Old Jun 10th, 08, 10:54 AM
Senior Tech Team
 
Join Date: Dec 2002
Location: Whitehall, PA
Posts: 1,050
Send a message via AIM to ricks_67
Re: Valve tip to rocker arm alignment

I have a set of merlin heads on my motor. The guide plates that came on the heads were way out of wack, then I was told Comp Cams or manley are the best, same situation. So I tried some GM and the same results. I wound up cutting the CC guide plates putting the heads on the motor setting them up and taking the heads to work to weld the plates together. Then I saw some cracks in the welds after about a year+. I talked to my machinists and he told me 2 things. All the person machining the head has to do is be off 1 degree and it throws everything out and nothing will work. He told me about the Dart 2 piece plates and I installed them. Cost $7.?? from Competition products but the rockers are centered now.

ricks_67 is offline  
post #6 of 10 (permalink) Old Jun 12th, 08, 9:05 AM Thread Starter
Lifetime Premium Member
Troy
 
Join Date: Apr 2004
Location: N.E.INDIANA
Posts: 792
Re: Valve tip to rocker arm alignment

Rick, If the GM guide plates don't help the problem I will order the adjustable type. Thanks for your input on the subject. I didn't know the adjustable type were even offered. Always good to learn something new
blacknblue is online now  
post #7 of 10 (permalink) Old Jun 12th, 08, 10:00 AM
Senior Tech Team
 
Join Date: Dec 2002
Location: Whitehall, PA
Posts: 1,050
Send a message via AIM to ricks_67
ricks_67 is offline  
post #8 of 10 (permalink) Old Jun 12th, 08, 1:54 PM
Tech Team
 
Join Date: Mar 2007
Location: OK
Posts: 978
Re: Valve tip to rocker arm alignment

Quote:
Originally Posted by ricks_67 View Post
I have a set of merlin heads on my motor. The guide plates that came on the heads were way out of wack, then I was told Comp Cams or manley are the best, same situation. So I tried some GM and the same results. I wound up cutting the CC guide plates putting the heads on the motor setting them up and taking the heads to work to weld the plates together. Then I saw some cracks in the welds after about a year+. I talked to my machinists and he told me 2 things. All the person machining the head has to do is be off 1 degree and it throws everything out and nothing will work. He told me about the Dart 2 piece plates and I installed them. Cost $7.?? from Competition products but the rockers are centered now.



Sorry to butt in, but what are those springs in your lifter valley?

-Kevin
1965 Chevy Biscayne
454cid, "peanut ports", Voodoo 60201, Approximately 9.37:1 CR
TH400, 3.36 Stock Rearend
65cayne is offline  
post #9 of 10 (permalink) Old Jun 12th, 08, 2:07 PM
Team Member
Walter
 
Join Date: Jan 2004
Location: CTX
Posts: 3,516
Re: Valve tip to rocker arm alignment

Quote:
Originally Posted by 65cayne View Post
Sorry to butt in, but what are those springs in your lifter valley?
That is what a Rev Kit looks like. Excellent for Hydraulic rollers to assist with valve float, or Solid rollers to keep the lifter in constant contact with the cam.

I run an Crower on my AFR headed Voodoo 60234 Solid roller 496 with Isky Red Zone EZ roll lifters.
Attached Thumbnails
Click image for larger version

Name:	rev kit 1.jpg
Views:	7
Size:	128.6 KB
ID:	14464   Click image for larger version

Name:	rev kit 2.jpg
Views:	7
Size:	130.9 KB
ID:	14465  

69 Chevelle SS
10.5-1 496/AFR 305's/Voodoo 60234 Solid Roller/TH400 4000 Stall/4.11 12 Bolt
wildman926 is offline  
post #10 of 10 (permalink) Old Jun 12th, 08, 2:09 PM
Senior Tech Team
 
Join Date: Dec 2002
Location: Whitehall, PA
Posts: 1,050
Send a message via AIM to ricks_67
Re: Valve tip to rocker arm alignment

it's a rev kit for solid roller lifters. It keeps the lifter on the cam.
ricks_67 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



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

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

Password:


Confirm Password:
Email Address
Please enter a valid email address. Note, you will be sent a confirmation request to this address.

Email Address:
OR

Log-in









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.



Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



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