Big Block Chevy Mainfolds Upside Down? - 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 11-24-2012, 06:02 PM
31fordcoupe's Avatar
Registered User
 

Last journal entry: Gunked up 454 water jacket
Last photo:
Join Date: Dec 2008
Location: Las Cruces, New Mexico
Posts: 324
Wiki Edits: 0

Thanks: 6
Thanked 0 Times in 0 Posts
Big Block Chevy Mainfolds Upside Down?

Hey gents,

Is there any mechanical issue that you can see that would prevent the use of log style big block Chevy manifolds being mounted upside down and forward for a turbo build?

The turbo will not be directly mounted to the exhaust manifold so it / they will not bare the brunt of the weight. Just trying to see if there was anything I was missing that would prevent me from taking stock exhaust manifolds like this one and mounting them upside down with the exhaust outlet pointing forward.

1973-1975 BBC 454 LH & RH Police Interceptor Exhaust Manifolds 353030 3994045 | eBay

I was also thinking, if I can use these, to maybe cut the cast iron between each exhaust port to help with expansion and contraction issues (I have seen that done before), but didn't know if it would weaken the overall manifold design to much / more than it would help with expansion and contraction.

Thanks in advance for your responses.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 11-24-2012, 07:14 PM
31fordcoupe's Avatar
Registered User
 

Last journal entry: Gunked up 454 water jacket
Last photo:
Join Date: Dec 2008
Location: Las Cruces, New Mexico
Posts: 324
Wiki Edits: 0

Thanks: 6
Thanked 0 Times in 0 Posts
Thanks for the reply. I am actually using a PT106. It's going in a 1984 1/2 ton Chevy Truck so I have tons of room under the hood.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 11-24-2012, 07:21 PM
Banned
 
Last photo:
Join Date: Jun 2005
Location: St. Louis, MO
Age: 31
Posts: 9,544
Wiki Edits: 0

Thanks: 20
Thanked 404 Times in 377 Posts
$250 for crappy manifolds? I'd just find a set of hugger or shorty headers, and make those work, you'll have an easier time making power and they're cheaper. the ONLY drawback is that they MAY not be as durable as cast iron manifolds- then again they could end up being just as good depending on what you buy and how it built.

Heat can kill any manifold or header so don't think a cast iron one will be bullet proof.
Reply With Quote Quick reply to this message
 
  #4 (permalink)  
Old 11-24-2012, 07:44 PM
31fordcoupe's Avatar
Registered User
 

Last journal entry: Gunked up 454 water jacket
Last photo:
Join Date: Dec 2008
Location: Las Cruces, New Mexico
Posts: 324
Wiki Edits: 0

Thanks: 6
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by ap72 View Post
$250 for crappy manifolds? I'd just find a set of hugger or shorty headers, and make those work, you'll have an easier time making power and they're cheaper. the ONLY drawback is that they MAY not be as durable as cast iron manifolds- then again they could end up being just as good depending on what you buy and how it built.

Heat can kill any manifold or header so don't think a cast iron one will be bullet proof.
Who said I was buying those particular manifolds? I just used that pic cus it was the first one that popped up. Chill.

I can pick up a set for $40 bucks locally so I just wanted to know their viability. I also never said they would be indestructible; again just wanted to know if they could be configured correctly.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 11-24-2012, 09:52 PM
31fordcoupe's Avatar
Registered User
 

Last journal entry: Gunked up 454 water jacket
Last photo:
Join Date: Dec 2008
Location: Las Cruces, New Mexico
Posts: 324
Wiki Edits: 0

Thanks: 6
Thanked 0 Times in 0 Posts
Thanks hcomp.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 11-25-2012, 09:50 AM
S10 Racer's Avatar
http://www.warsprints.com
 

Last journal entry: W.A.R. (Wingless Auto Racing) Sprint Car Racing
Last photo:
Join Date: Nov 2007
Location: Missouri Dirt Tracks
Age: 58
Posts: 2,026
Wiki Edits: 0

Thanks: 18
Thanked 87 Times in 76 Posts
They will not bolt up upside down.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 11-25-2012, 10:12 AM
OneMoreTime's Avatar
Hotrodders.com moderator
 
Last wiki edit: Health and safety in the shop or garage
Last journal entry: Yard Dog pic
Last photo:
Join Date: Jul 2004
Location: Washington State
Age: 72
Posts: 8,828
Wiki Edits: 3

Thanks: 219
Thanked 457 Times in 409 Posts
If all else fails I can take a exhaust manifold gasket or make a pattern and take it to my laser cutter guy and have a manifold flange made and then get some ready bent tubes and make an exhaust header that fits my particular needs. Sometimes guys try to save some cash which is fine but then wind up screwing themselves..learned that lesson..

Sam
__________________
I have tried most all of it and now do what is known to work..
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 11-25-2012, 11:08 AM
31fordcoupe's Avatar
Registered User
 

Last journal entry: Gunked up 454 water jacket
Last photo:
Join Date: Dec 2008
Location: Las Cruces, New Mexico
Posts: 324
Wiki Edits: 0

Thanks: 6
Thanked 0 Times in 0 Posts
Ok thanks a million for the replies guys. Guess that answers that question. I just didn't want to spend $$$$ on an aftermarket header designed for turbo applications.

I do have a good wire feed but just not that good at using it yet. Good friend of mine is an expert welder so I guess we will just get a good kit and get after it.

Thanks again.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 11-25-2012, 01:55 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Posts: 5,031
Wiki Edits: 1616

Thanks: 128
Thanked 616 Times in 565 Posts
Quote:
Originally Posted by S10 Racer View Post
They will not bolt up upside down.
If you swap them side to side and THEN flip them upside down, I believe you'll see they bolt up.

The outlet may not be where you want it. There may also be a slight mismatch between the manifold and head ports, but this can be taken care of w/a die grinder and/or slotting the holes.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 11-25-2012, 03:57 PM
31fordcoupe's Avatar
Registered User
 

Last journal entry: Gunked up 454 water jacket
Last photo:
Join Date: Dec 2008
Location: Las Cruces, New Mexico
Posts: 324
Wiki Edits: 0

Thanks: 6
Thanked 0 Times in 0 Posts
Cobalt,

As alway I appreciate your insight. Looking at the manifolds if I switched sides and turned them upside down, wouldn't one collector be facing upward and the other collector facing forward with a slight upward tilt? Please correct me if I'm looking at them incorrectly.
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 11-25-2012, 06:14 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Posts: 5,031
Wiki Edits: 1616

Thanks: 128
Thanked 616 Times in 565 Posts
Quote:
Originally Posted by 31fordcoupe View Post
Cobalt,

As alway I appreciate your insight. Looking at the manifolds if I switched sides and turned them upside down, wouldn't one collector be facing upward and the other collector facing forward with a slight upward tilt? Please correct me if I'm looking at them incorrectly.
Like I said earlier, the outlets might not be where you want them...
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 11-25-2012, 06:29 PM
S10 Racer's Avatar
http://www.warsprints.com
 

Last journal entry: W.A.R. (Wingless Auto Racing) Sprint Car Racing
Last photo:
Join Date: Nov 2007
Location: Missouri Dirt Tracks
Age: 58
Posts: 2,026
Wiki Edits: 0

Thanks: 18
Thanked 87 Times in 76 Posts
I tried switching block hugger headers for the BBC S10 I built and the ports are too far off to correct with a die grinder. I actually cut the flanges off the tubes and flipped them 180* and welded them back on to get them to fit. Not saying it's the best way but I didn't want to fork out $1500.00 for a set of Lemon headers. The way mine came out, it would be so easy to install turbo's on.
Attached Images
 
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 11-25-2012, 06:35 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Posts: 5,031
Wiki Edits: 1616

Thanks: 128
Thanked 616 Times in 565 Posts
The ones we did in the boat were off by about 0.110" before being reworked. I doubt the outlets are going to work for him like that anyway.
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 11-26-2012, 08:04 PM
Member
 
Last photo:
Join Date: Dec 2004
Location: San Antonio, Texas
Age: 53
Posts: 4,023
Wiki Edits: 0

Thanks: 0
Thanked 26 Times in 26 Posts
chevy 454 turbo manifolds | eBay
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:
Insurance
Please select your insurance company (Optional)

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
Big block pil pump on small block Chevy dallam11 Engine 22 03-24-2012 07:36 PM
big block or small block chevy 69YENKONOVA Engine 81 05-13-2010 07:26 AM
Big Block vs Small Block Chevy bigjoedo Engine 82 05-03-2010 03:36 PM
Aftermarket Block Big Block Chevy camaro 68 Engine 2 09-15-2003 08:19 PM
55 chevy small block to big block ehchvac Engine 0 05-02-2002 08:23 PM


All times are GMT -6. The time now is 09:14 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.