4.3 to 5.7 - 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 09-30-2004, 09:20 PM
Member
 
Join Date: Oct 2003
Posts: 41
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
4.3 to 5.7

will the accesories off of a '91 4.3 bolt on to a 5.7? This particular 4.3 is a serpentine with a/c. does it matter if the 5.7 is pre or post '87? Thanks!

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 09-30-2004, 09:52 PM
Lonestar's Avatar
"May the Schwartz be with you"
 
Last wiki edit: How to rebuild an engine
Last journal entry: Finally getting going...
Last photo:
Join Date: Aug 2004
Location: United States
Age: 44
Posts: 1,054
Wiki Edits: 1

Thanks: 0
Thanked 0 Times in 0 Posts
How about a little more info.

Car? Year? Year of 5.7?

Not to be rude, but give specifics if you want an answer.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 09-30-2004, 10:49 PM
Member
 
Join Date: Oct 2003
Posts: 41
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
sorry about that. I'm wondering if i can use my original 4.3's accessories on a 350 to swap into my 91 sonoma. I plan on using a late model longblock from a full size gm truck.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 10-01-2004, 05:50 PM
NorthStar's Avatar
Member
 
Last photo:
Join Date: Feb 2003
Location: Minnesota
Age: 51
Posts: 847
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
The early style heads with perimeter bolt valve cover and newer center bolt valve cover heads have different bolt spacing for the accessory bolt holes.

There is a small difference that was made to the Vortec engine blocks, they dont have a hole for the water pump bypass like the older blocks do. The bypass comes out of the water pump and is plumbed to intake with rubber hose kind of like a big block Chevy.

So as long as your "new" 350 has centerbolt valve covers and the block is pre 1996. All the stuff will bolt up to the heads and existing water pump will work just fine.

If the block is 1996 & newer it could be used too but you would have to drill some little holes in thermostat. Also the 1996 & up Vortec engines have a roller cam so would be a good reason to use it.

You can keep the 350 damper the pulley will bolt right on.



Cant really think of anything else.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 10-01-2004, 07:34 PM
Member
 
Join Date: Oct 2003
Posts: 41
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
wow, thats great. This 350 swap is looking easier and easier. I thought that 87-95 SBC's were roller hydraulic cams though, or is that just LT1's and LT4's?
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 10-01-2004, 07:52 PM
Almost an old guy...
 
Last photo:
Join Date: Apr 2004
Location: Indiana
Age: 59
Posts: 181
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I just finished a swap with a 355 into my 91 S-15 Jimmy, I think you may find that you will have some major clearance issues using the 4.3 setup in the swap, not enough room for the fan...
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 10-01-2004, 09:47 PM
Member
 
Join Date: Oct 2003
Posts: 41
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
My plan is to move the radiator and AC condensor forward 1-2 inches and run an electric fan. (this truck runs plenty cold now and isn't used for towing, and i live in new england, so I dont anticipate any overheating problems.) I also am going to hammer the firewall a little (according to the JTR hand book) and set the engine a half inch to 3/4inch rear. I will use the setback plate on the axle. Seems like it will work in theory. Anyone see any flaws?
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 10-01-2004, 09:53 PM
Ghetto Jet's Avatar
current hot rod: CTS-V
 

Last journal entry: Lets Get Started With the Improvements
Last photo:
Join Date: Nov 2003
Location: Pennsylvania
Age: 28
Posts: 1,739
Wiki Edits: 0

Thanks: 10
Thanked 7 Times in 7 Posts
Will you have any problems with emissions testing?
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 10-01-2004, 09:56 PM
Member
 
Join Date: Oct 2003
Posts: 41
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Yes, I want it to be emissions legal as it will be my daily driver.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 10-02-2004, 06:03 AM
Almost an old guy...
 
Last photo:
Join Date: Apr 2004
Location: Indiana
Age: 59
Posts: 181
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
With the electric fan and moving the rad forward you shouldn't have any clearance issues. Get one really big hammer for that firewall, mine was hell to pound in and could have used a little more on the passengers side for the hedder collector...
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



All times are GMT -6. The time now is 08:39 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.