Retorquing intake manifold SBC - 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 04-10-2013, 01:09 PM
Registered User
 
Last photo:
Join Date: May 2008
Location: ohio
Posts: 1,585
Wiki Edits: 0

Thanks: 48
Thanked 65 Times in 62 Posts
Retorquing intake manifold SBC

Hello guys just a quick question here. I have had my small block chevy in my truck for about a week now and after several heat cycles I need to re torque the intake manifold but I have just a couple of questions. First I know the torque is supposed to be 25ftlbs but I no longer have cast iron heads but aluminum heads and I am afraid to try to put 25ftlbs of torque on the bolts cause don't want to strip them. Would 20 be enough? Also I can't get my torque wrench on all the bolts just the ones up front and the driver side ones in rear. But I can only get a wrench on the 4 center ones and hardly get anything on the passenger side rear bolts? This is the old style slanted intake pattern most common on 87 and earlier small block chevy's. Any of you guys on here able to torque them all with a torque wrench and can I safely torque the bolts to 25 without stripping the threads in the heads.
Thanks guys sorry to bother. First time here with aluminum heads.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 04-10-2013, 03:08 PM
Banned
 
Last photo:
Join Date: Nov 2012
Location: Florida
Posts: 2,442
Wiki Edits: 0

Thanks: 195
Thanked 461 Times in 410 Posts
With aluminum heads 25 is to much 20 is better. But i just get them snug.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 04-10-2013, 03:52 PM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,304
Wiki Edits: 0

Thanks: 6
Thanked 400 Times in 394 Posts
I never use a torque wrench on these bolts. Just snugg them back up again with a wrench.
Repeat as required till the manifold and gasket takes a set. Do not use excessive force.
Excessive torque is NOT BETTER.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 04-10-2013, 06:09 PM
Registered User
 
Last photo:
Join Date: May 2008
Location: ohio
Posts: 1,585
Wiki Edits: 0

Thanks: 48
Thanked 65 Times in 62 Posts
Well for right now I torqued the bolts I can get too but only 15 pounds and hand tighten with a wrench and a small ratchet but I just snugged them. I am afraid to do it any tighter but one bolt was almost loose before I checked them. Unfortunately I have weaker hand and arm strength from taking chemo and radiation last year cause of my cancer I had and its hard for me to judge my tightening of certain things at times and I just don't want to over do it. I bet I should leave them as tight as they are for now and recheck after a few more heat cycles and if they no longer are getting loose then I should be good. Heck even 25 ftlbs seems a lot for those small bolts.
thanks guys
Eric
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 04-10-2013, 09:01 PM
496CHEVY3100's Avatar
Appalachian American
 

Last journal entry: ,
Last photo:
Join Date: Jul 2012
Location: Appalachia GA
Posts: 880
Wiki Edits: 0

Thanks: 519
Thanked 341 Times in 298 Posts
I have aluminum heads and aluminum intake ,I used ARP head studs ,intake bolts and header bolts ,the intake is torqued to 35 lbs exaust to 35 lbs and safety wired heads 90 &80 , The Aluminum Heads are not the problem ,it is the torque yield of the fastners ,use good quality fastners ,Felpro no retorque gaskets,you will not have a problem,on the small block make sure the intake bolts are long enough for aluminum intake since it is thicker at flange ,but not long enough to hit pushrods on 3 cylinders. also you can use a torque wrench if you remove the Carb,
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 04-11-2013, 08:39 AM
Registered User
 
Last photo:
Join Date: May 2008
Location: ohio
Posts: 1,585
Wiki Edits: 0

Thanks: 48
Thanked 65 Times in 62 Posts
Hello well I am using arp head studs on the heads and I don't re torque them as I use felpro 1003 head gaskets and they don't need re torqued. As far as intake goes I am using grade 8 bolts with lock washers and good fastners on the headers. 35 ftlbs seems a bit much for a small block even factory specs only calls for 30 but if you was able to torque it to that great I just don't want to over do mine and strip out my threads as aluminum strips easier then cast iron and that is what I always ran till now so this is all new to me.
eric
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 04-11-2013, 09:02 AM
496CHEVY3100's Avatar
Appalachian American
 

Last journal entry: ,
Last photo:
Join Date: Jul 2012
Location: Appalachia GA
Posts: 880
Wiki Edits: 0

Thanks: 519
Thanked 341 Times in 298 Posts
Quote:
Originally Posted by eric32 View Post
Hello well I am using arp head studs on the heads and I don't re torque them as I use felpro 1003 head gaskets and they don't need re torqued. As far as intake goes I am using grade 8 bolts with lock washers and good fastners on the headers. 35 ftlbs seems a bit much for a small block even factory specs only calls for 30 but if you was able to torque it to that great I just don't want to over do mine and strip out my threads as aluminum strips easier then cast iron and that is what I always ran till now so this is all new to me.
eric
Mine is a big block 496 ,but aluminum is the same ,it don't know if it is on a small block or a BBC Checked the factory manual from 1969 chevy with aluminum heads since I am running a 69 tripower alum intake and didn't want to take a chance in warpage ,i torqued mine to specs,i guess after heat set they should be aroung 28-30 have never rechecked them since I use sealer on my intake bolts so oil will not stain 4 center bolts, drop down to about 28-30( if you oil the threads ),but you should use the specs you are comfortable with,i have never had problems with leakage ,warping or stripped threads.,,just a note see what the screw in studs on the guide plates torque to in the aluminum heads, Good luck with your build.

Last edited by 496CHEVY3100; 04-11-2013 at 09:09 AM.
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:
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
Help Id this old sbc intake manifold B@D Hotrodding Basics 4 09-13-2011 06:38 PM
Best SBC Intake Manifold 1972RedNeck Engine 21 12-29-2010 07:06 PM
sbc intake manifold ? 77novaguy Engine 3 11-09-2008 12:58 PM
GM SBC intake Manifold Retired Hotrodding Basics 12 01-04-2008 08:11 PM
GM SBC intake Manifold Retired Engine 3 01-03-2008 03:47 PM


All times are GMT -6. The time now is 05:42 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.