exhaust manifod help - CorvetteForum - Chevrolet Corvette Forum Discussion

Go Back   >
Log In 
Register FAQ Search Today's Posts Mark Forums Read Vendor Directory

C3 Tech/Performance
V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette

exhaust manifod help

Reply
 
 
 
Thread Tools Search this Thread
Old 05-06-2012, 01:31 AM   #1
mrcarguy
Junior Member
Thread Starter
 
Member Since: Jun 2011
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Default exhaust manifod help

Hi Everyone,
A quick question on the 81 original exhaust manifolds, Is there a aftermarket manifold that would bolt up to the factory exhaust pipes without modifying?
mrcarguy is offline   Reply With Quote
Old 05-07-2012, 02:32 PM   #2
63mako
CF Senior Member
St. Jude Donor '08-'09
 
63mako's Avatar
 
Member Since: May 2005
Location: Millington Illinois
Posts: 10,061
Thanked 11 Times in 11 Posts
Default

These will do what you want. Not as much power gain as long tube headers. Available in 2" or 2 1/2" flange.
http://www.vetteheaders.com/servlet/...rvette+Headers
63mako is offline   Reply With Quote
Old 05-07-2012, 06:48 PM   #3
doctorgene
CF Senior Member
Support Corvetteforum!
 
Member Since: Jul 2007
Posts: 1,684
Thanked 4 Times in 4 Posts
Default

Yes Sir; Your Question, has many answers. How much do you want to spend? What H. P. gain are you looking for? If you have the original Stainless Steel 1981 & 1982 only, G.M. Factory block huger ones now, long tube headers are what is the next change should be. If you have cast iron manifolds & are on a budget, Factory S. S. are the way to gain around 14 H. P. No changes to existing head pipes. Have a great one. Gene
doctorgene is online now   Reply With Quote
Old 05-07-2012, 10:08 PM   #4
mrcarguy
Junior Member
Thread Starter
 
Member Since: Jun 2011
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Default

63mako and doctorgrene,
Thank you for your help. I was working with the original 81 exhaust manifolds. I wanted to remove the emission pipes (which I did) and have the manifold's ceramic coated. Unfortunately, they have some cracks in them. So I tried to have them welded but they are to thin. I would like more power but I am not able to spend much now. I believe the previous owner removed the original carb.air pump and possibly the distributor. I would like to keep the temperature down under the hood, don't have a bunch of money to spend. I was hoping to find a manifold that would just bolt up to the original pipes and head. The one's that 63mako found are very nice but more then I have to spend. Is there anything else out there that would fit my 81 Vette?
mrcarguy is offline   Reply With Quote
Old 05-07-2012, 10:08 PM   #5
mrcarguy
Junior Member
Thread Starter
 
Member Since: Jun 2011
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Default

63mako and doctorgrene,
Thank you for your help. I was working with the original 81 exhaust manifolds. I wanted to remove the emission pipes (which I did) and have the manifold's ceramic coated. Unfortunately, they have some cracks in them. So I tried to have them welded but they are to thin. I would like more power but I am not able to spend much now. I believe the previous owner removed the original carb.air pump and possibly the distributor. I would like to keep the temperature down under the hood, don't have a bunch of money to spend. I was hoping to find a manifold that would just bolt up to the original pipes and head. The one's that 63mako found are very nice but more then I have to spend. Is there anything else out there that would fit my 81 Vette?
mrcarguy is offline   Reply With Quote
Old 05-07-2012, 10:21 PM   #6
terry82
CF Senior Member
 
Member Since: Jul 2000
Location: columbia city in
Posts: 5,402
Thanked 41 Times in 38 Posts
Default

http://www.mcjackscorvettes.com/ i think these pipes are some of the best but they are verry expensive .they will bolt right up.if you want cheaper pipes summit has some long tube ones that are verry resonable.but then you have to get them connected to the rest of the exhaust system.i would stop and think what you want to do with this car .you can do it cheap now and then do it again later or you can do it right this time and be done .i would check e=bay and this forum in the for sale section for factory pipes .
terry82 is offline   Reply With Quote
Old 05-07-2012, 10:58 PM   #7
speedreed8
CF Senior Member
 
speedreed8's Avatar
 
Member Since: Oct 2006
Location: tyler texas
Posts: 1,683
Thanks: 0
Thanked 6 Times in 6 Posts
Default

here is a cheaper alternative, i used these dormans brand before with good luck.

http://www.oreillyauto.com/site/c/se...make=Chevrolet

Last edited by speedreed8; 05-07-2012 at 11:03 PM.
speedreed8 is offline   Reply With Quote
Old 05-08-2012, 12:54 AM   #8
terry82
CF Senior Member
 
Member Since: Jul 2000
Location: columbia city in
Posts: 5,402
Thanked 41 Times in 38 Posts
Default

Quote:
Originally Posted by speedreed8 View Post
here is a cheaper alternative, i used these dormans brand before with good luck.

http://www.oreillyauto.com/site/c/se...make=Chevrolet
could just be the pic that they are using but i think you want a center dump flange .i would look for a old pair of the ram horns .
terry82 is offline   Reply With Quote
Old 05-08-2012, 08:02 AM   #9
speedreed8
CF Senior Member
 
speedreed8's Avatar
 
Member Since: Oct 2006
Location: tyler texas
Posts: 1,683
Thanks: 0
Thanked 6 Times in 6 Posts
Default

yea, that looks like the wrong ones, this is the one i used, fits either side.
http://www.oreillyauto.com/site/c/de...2385&ppt=C0022
speedreed8 is offline   Reply With Quote
Old 05-08-2012, 10:32 AM   #10
Easy Mike
CF Senior Member
Support Corvetteforum!
Cruise-In II Veteran
 
Easy Mike's Avatar
 
Member Since: Jun 2000
Posts: 32,806
Thanks: 0
Thanked 230 Times in 214 Posts
Default

FWIW: the stock 81 and 82 stainless manifolds are some of the best to ever come from GM. They amount to factory short tube headers. I agree with Doctorgene: keep them.
Easy Mike is online now   Reply With Quote
Old 05-08-2012, 01:25 PM   #11
terry82
CF Senior Member
 
Member Since: Jul 2000
Location: columbia city in
Posts: 5,402
Thanked 41 Times in 38 Posts
Default

Quote:
Originally Posted by speedreed8 View Post
yea, that looks like the wrong ones, this is the one i used, fits either side.
http://www.oreillyauto.com/site/c/de...2385&ppt=C0022
$112 dollars seems like a bargin.but i would clean them up inside and out then send them out to be ceramic coated.
terry82 is offline   Reply With Quote
Old 05-08-2012, 03:35 PM   #12
scottyp99
CF Senior Member
 
scottyp99's Avatar
 
Member Since: Mar 2008
Location: Oxford MA-----You just lost the game!!!!
Posts: 5,724
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by mrcarguy View Post
63mako and doctorgrene,
Thank you for your help. I was working with the original 81 exhaust manifolds. I wanted to remove the emission pipes (which I did) and have the manifold's ceramic coated. Unfortunately, they have some cracks in them. So I tried to have them welded but they are to thin. I would like more power but I am not able to spend much now. I believe the previous owner removed the original carb.air pump and possibly the distributor. I would like to keep the temperature down under the hood, don't have a bunch of money to spend. I was hoping to find a manifold that would just bolt up to the original pipes and head. The one's that 63mako found are very nice but more then I have to spend. Is there anything else out there that would fit my 81 Vette?
Too thin to weld? I think you probably just need to find a better welder. There are guys out there that can weld an ice cube to a piece of wood. (OK, maybe I'm exaggerating just a little bit.)


Keep the shiny side up!
Scott
scottyp99 is offline   Reply With Quote
Old 05-08-2012, 04:48 PM   #13
billla
CF Senior Member
Support Corvetteforum!
St. Jude Donor '14
 
Member Since: Jun 2004
Location: Seattle WA
Posts: 5,985
Thanked 3 Times in 3 Posts
Default

Quote:
Originally Posted by scottyp99 View Post
Too thin to weld? I think you probably just need to find a better welder.
I can't think of anywhere on those manifolds that is "thin"...
billla is offline   Reply With Quote
Go Back   CorvetteForum - Chevrolet Corvette Forum Discussion >
Reload this Page
  • exhaust manifod help
  •  
     
    Reply

    Related Topics
    Thread Thread Starter Forum Replies Last Post
    Wanted, LT1 Exhaust Manifolds GRX C4 Parts for Sale/Wanted 4 02-11-2006 08:08 PM
    Exhaust Manifold Question SDS Photography C4 Tech/Performance 2 06-14-2005 10:31 PM
    FS 84 EXHAUST MANIFOLDS vettespd20 C4 Parts for Sale/Wanted 0 12-04-2003 10:11 PM
    LT 4 exhaust manifolds vstol C4 Parts for Sale/Wanted 0 09-22-2002 04:24 PM


    Thread Tools Search this Thread
    Search this Thread:

    Click for Advanced Search

    Posting Rules
    You may not post new threads
    You may not 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 Off
    Pingbacks are Off
    Refbacks are Off

    Forum Jump


    All times are GMT -4. The time now is 12:14 PM.