Valve Spring 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 05-14-2006, 08:53 PM
DaSouthWon's Avatar
I put up the tools against$300
 
Last photo:
Join Date: Apr 2006
Location: Memphis,Tennessee
Age: 35
Posts: 683
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
Valve Spring Question

I just started disassembling a pair of 781 heads that are fresh but I wanted to do a little porting and polishing, plus they have been sitting up for 3 years so I probably need to replace the seals anyway. My question concerns the valve springs. Upon removing the first valve I found that there are actually 3 springs per valve, and they are incredibly stiff. Is this common? They are going on a 454 with an xtreme energy 274h cam. It seems that these springs are going to be a little stout for break in, but I'm a newbie so whats an educated opinion?
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 05-14-2006, 09:05 PM
97Z28's Avatar
NTI Grad.
 
Last photo:
Join Date: Jul 2005
Location: Chardon, Ohio
Age: 32
Posts: 607
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
im not too much on heads and valve springs. not really my specialty, but seems like whoever built the heads intended them for high reving. if your uncomfortable with the stifness of springs on breakin try to find a set with lower seat pressures to use on break in then change them afterwards. hope this helps....

-Matt
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 05-14-2006, 09:24 PM
DaSouthWon's Avatar
I put up the tools against$300
 
Last photo:
Join Date: Apr 2006
Location: Memphis,Tennessee
Age: 35
Posts: 683
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
If I pull the seals off of the valves are they shot?
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 05-15-2006, 06:27 AM
BOBCRMAN@aol.com's Avatar
Member
 
Last photo:
Join Date: May 2002
Location: Holly, michigan
Posts: 7,963
Wiki Edits: 0

Thanks: 13
Thanked 221 Times in 210 Posts
Depends on the type of seal,, The white teflon seals are usually destroyed on removal. The black/blue umbrella type seals, if removed carefully, can be reused. Same goes for the positive (metal band type) seals. Be careful taking them off and they are usually OK.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 05-15-2006, 08:31 AM
johnsongrass1's Avatar
Race it, Don't rice it!
 
Last photo:
Join Date: Jul 2002
Location: Columbia, Mo
Age: 37
Posts: 4,062
Wiki Edits: 0

Thanks: 0
Thanked 8 Times in 8 Posts
Are you sure it's not a dual spring with damper? I don't know why anyone would run a triple spring on that head.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 05-15-2006, 12:05 PM
DaSouthWon's Avatar
I put up the tools against$300
 
Last photo:
Join Date: Apr 2006
Location: Memphis,Tennessee
Age: 35
Posts: 683
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
well there were two springs that find of look like coiled flat steel at an angle, and the smallest inner spring was a regular coil type spring
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 05-16-2006, 10:44 AM
johnsongrass1's Avatar
Race it, Don't rice it!
 
Last photo:
Join Date: Jul 2002
Location: Columbia, Mo
Age: 37
Posts: 4,062
Wiki Edits: 0

Thanks: 0
Thanked 8 Times in 8 Posts
Sounds like a single spring with 2 dampers or a dual spring with single damper.


Dual springs look like regular coil springs, one outside, inside, with a flat wound damper in the middle.

Triple springs don't usaully have dampers to save space.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 05-16-2006, 10:46 AM
johnsongrass1's Avatar
Race it, Don't rice it!
 
Last photo:
Join Date: Jul 2002
Location: Columbia, Mo
Age: 37
Posts: 4,062
Wiki Edits: 0

Thanks: 0
Thanked 8 Times in 8 Posts
Huhhh...

To answer you question, I would remove the inner spring for break in or use breakin rockers. More work but less expensive than a cam repair.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 05-17-2006, 12:32 AM
DaSouthWon's Avatar
I put up the tools against$300
 
Last photo:
Join Date: Apr 2006
Location: Memphis,Tennessee
Age: 35
Posts: 683
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
after further inspection, actually I just looked at them again to make sure, the outer spring is a coil, the inner spring is the flat steel type, and the inner is a coil spring. Just as the previous post described. So would you guys suggest removing the inner / smallest spring for break in? Im everybit of 6' 225#s and it took everything I had to compress the springs with a pry bar type spring compressor to get the springs compressed far enough to remove the retainers. They just seem kind of stout to me, but then again maybe I'm just a puss. lol. thanks for the help
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 05-17-2006, 06:05 AM
1ownerT's Avatar
Home School Valedictorian
 
Last wiki edit: Health and safety in the shop or garage Last photo:
Join Date: Dec 2004
Location: Iowa
Age: 52
Posts: 1,645
Wiki Edits: 4

Thanks: 0
Thanked 3 Times in 3 Posts
I would install the springs that are reccomended for that cam, last thing you want is to assemble then a thousand miles later have no lobes left on the cam.
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 05-17-2006, 10:11 AM
johnsongrass1's Avatar
Race it, Don't rice it!
 
Last photo:
Join Date: Jul 2002
Location: Columbia, Mo
Age: 37
Posts: 4,062
Wiki Edits: 0

Thanks: 0
Thanked 8 Times in 8 Posts
Quote:
Originally Posted by DaSouthWon
after further inspection, actually I just looked at them again to make sure, the outer spring is a coil, the inner spring is the flat steel type, and the inner is a coil spring. Just as the previous post described. So would you guys suggest removing the inner / smallest spring for break in? Im everybit of 6' 225#s and it took everything I had to compress the springs with a pry bar type spring compressor to get the springs compressed far enough to remove the retainers. They just seem kind of stout to me, but then again maybe I'm just a puss. lol. thanks for the help
It's not unusual for a dual spring set up to have 400 pounds of spring pressure. Remove the inner for breakin.
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 05-17-2006, 10:21 AM
T buckets rule
 
Join Date: Oct 2005
Location: Hills of TN
Age: 63
Posts: 134
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I would take the heads and do the porting that you want to do. Then take the heads to a good shop and have the springs installed, take the cam card with you. You might have roller springs there an it will ruin a cam real quick. Do it right the first time and it will be a lot cheaper and it will last.

Your in Memphis, take them to Racing Head Service. It won't get any better than that.
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 05-17-2006, 05:49 PM
King of my Man-cave.
 
Last photo:
Join Date: Nov 2003
Location: Michigan
Age: 55
Posts: 2,836
Wiki Edits: 0

Thanks: 2
Thanked 4 Times in 2 Posts
One thing that has to be checked is the proper installed height for the spring. It is possible that those heads have an installed height of 1.800" instead of the normal 1.875" for BBC heads. If your heads have the exhaust spring pockets cut for rotators, you have the heads with the 1.800 installed height.

If you springs are for 1.875" installed height, oops!

tom
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 05-17-2006, 05:55 PM
DaSouthWon's Avatar
I put up the tools against$300
 
Last photo:
Join Date: Apr 2006
Location: Memphis,Tennessee
Age: 35
Posts: 683
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
there is a rotator on the intake spring and just a shim on the exhaust, or maybe its the other way around. Is this correct?
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
700R4 Why are the TCI manual valve body instructions so lousy? Bayley Transmission - Rearend 24 02-16-2009 12:49 PM
Compressed Valve Spring Fatigue Garbonzo Bojangles Engine 8 01-25-2006 06:44 PM
Valve spring ????? 66truck4spd Engine 1 08-25-2005 06:52 AM
Help! Valve spring seat pressure? camaro 68 Engine 3 05-20-2005 11:43 AM
valve spring diameters matt_ramsey Engine 2 03-07-2005 02:01 PM


All times are GMT -6. The time now is 08:52 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.