Valve lash question - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 07-03-2006, 12:11 PM
mkebaird's Avatar
Registered User
 
Last photo:
Join Date: Mar 2006
Location: Boise Idaho
Posts: 4
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Valve lash question

I've got a 350 chevy with mechanical lifters -trouble is I didn't ask 'what cam is in it' when I bought it. Any ideas on how to find out what the proper valve lash should be? The motor and heads are cast iron and it has stamped roller rockers - it dyno'd at 430hp. Thanks for any suggestions.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 07-03-2006, 12:27 PM
xntrik's Avatar
Save a horse, Ride a Cowboy.
 
Last photo:
Join Date: Jul 2005
Location: Arkansas
Posts: 5,131
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Obviously you have exhausted all routes to determine what you have.

Is it running well now? Does it sound OK now? I would measure the clearances cold and note those figures and make adjustments based on that.

Monitor a vacuum gauge closely to determine if the valves are closing when it gets hot.

If the engine is not runable now, I would pull the valve covers and measure what the clearances are now, right off the dyno. Surely the engine assembler got the clearances close.

Most everything will be in the 20/20 range, give or take a couple.
Note= it takes a very good human to get the valves within .002 with a hand feeler gauge.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 07-03-2006, 12:36 PM
Hotrodders.com Moderator
 

Last journal entry: PICTURE TEST
Last photo:
Join Date: Jan 2004
Location: york pa
Age: 52
Posts: 2,795
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
cam

It all depends on how good you are with a indicator...

Solid cams have what is called a lash ramp ground into them. The lash ramp is usually close to what the valve lash is...


You are going to have to check it down on the lifter. If you rotate the engine until the lifter is on the base circle of the cam and then set the indicator to zero...rotate the engine in the normal direction and watch the indicator real close, as the needle starts to move you will see it move slow at first and then faster when it starts on the opening ramp... do it a few times and you will catch on to it... If the lash ramp is say .020" i would start with a lash of about .022" or so... don't lash it less then the ramp....


Keith
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 07-06-2006, 10:23 PM
mkebaird's Avatar
Registered User
 
Last photo:
Join Date: Mar 2006
Location: Boise Idaho
Posts: 4
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks

Thanks for the replies - I'll check the lash as it is now - it's running good but I'm starting to hear a little valve train clatter. I'll try the indicator method next time I have the intake off.

Hope you all had a good 4th...

Mike
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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 for yourself.
Email Address:

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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
valve lash??? chevyelc81 Engine 5 03-29-2009 07:25 PM
SBC 350 Valve lash !? boneyard Buick Engine 5 11-09-2005 08:21 AM
Best way to install valve cover gromits. and breather question? Jag Daddy Engine 1 05-03-2004 03:20 AM
If the valve lash is off.... KeithB123 Engine 2 09-21-2003 06:30 PM
Valve lash Sampson Engine 4 08-24-2003 07:27 PM


All times are GMT -6. The time now is 06:06 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.