Exaust header temps - 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
lost password?   |   register now

LinkBack Thread Tools
  #1 (permalink)  
Old 11-08-2012, 07:43 AM
Registered User
Last photo:
Join Date: Dec 2010
Location: NW Texas
Posts: 7
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Exaust header temps

I have a SBC 350 from a 1974 Corvette. I had it bored .030 over put in a mild Edelbrock cam, Hyd lifters. It has an Edelbrock dual plane intake and an Edelbrock Carb. A 650 cfm if I remember correctly. This engine is in a street rod, 40 Ford, 4 door Pickup. Has been built for 15 years plus. the temps on the header tubes are cylendar # 1 - 300degrees F, #2- 300d, #3 -530d, #4 - 450d, #5 - 360d, #6- 470d, #7- 350d, #7- 350d and #8 - 390d. Is there a problem and what is it? I don't like there being some tubes a lot hotter than the others.

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 11-08-2012, 08:08 AM
F-BIRD'88's Avatar
Yada Yada Yada
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,153
Wiki Edits: 0

Thanks: 5
Thanked 380 Times in 374 Posts
This is typical of a dual plane manifold at idle. Its not a big problem.
Make sure the motor has enough spark advance at idle.
lack of idle spark advance makes the headers run hotter than they need to.
The bigger the camshaft used, the more the motor will like plenty of timing at idle.

Carbs can be custom calibrated specificly for a specific dual plane manifold
to even out the idle fuel distribution better so all cylinders run close to the same.
EG: carb booster venturii tweeking (bottom shape of the booster, Idle circuit tweeking,
Intake manifold plenum floor fuel directors. (turtle) correct manifold plenum heat (exhaust)
and or heated air inlet helps a lot. Factory stock oem carbs and manifolds are fine tuned like this.
All the factory OEM smog air cleaner stuff ( Heat management) has a purpose.
A cold intake manifold will have more varience. Liquid fuel does not burn.

One thing you can do is look for and eliminate all manifold vacuum leaks that can make 1 or more cylinders run lean
and effect exhaust temps.
None of yours look excessive.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 11-08-2012, 09:19 AM
Registered User
Last photo:
Join Date: Dec 2010
Location: NW Texas
Posts: 7
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks, I was not sure if this was a big problem or not. Will make sure there is pleanty of advance. maybe I can get the carb tuned and improve things.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply

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.
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

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
Should I use 2.25" or 2.50" exaust pipes, and other exaust questions. TireTracks Engine 5 07-27-2010 10:35 AM
Header temps... jmbjs Engine 9 05-16-2007 03:44 PM
temps for bodywork cornfieldcars Body - Exterior 2 10-19-2004 08:23 AM
header temps ccnova Engine 0 11-30-2003 06:13 PM
Pyrometer temps ? roys63 Engine 8 06-04-2003 05:00 PM

All times are GMT -6. The time now is 06:08 AM.

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.