swap a vortec engine to a 5.7 TBI - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum

Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans Advertise
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine> Modern Electronic Engines
User Name
lost password?   |   register now

Closed Thread
LinkBack Thread Tools
  #1 (permalink)  
Old 04-29-2018, 05:06 PM
Registered User
Join Date: Apr 2018
Posts: 1
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
swap a vortec engine to a 5.7 TBI

I have a 1995 350 5.7 TBI and I want to put it into a 1997 GMC 1500 Truck that had a Vortec engine. Will it be a compatible swap?

Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 04-29-2018, 07:40 PM
Registered User
Join Date: Apr 2007
Posts: 12,809
Wiki Edits: 0

Thanks: 256
Thanked 1,283 Times in 1,013 Posts
Originally Posted by Mr.Dunn View Post
I have a 1995 350 5.7 TBI and I want to put it into a 1997 GMC 1500 Truck that had a Vortec engine. Will it be a compatible swap?
Not easy this is a system generation jump from OBD I to OBD II. The injection systems are different as is ignition and even the intake and heads.

A short block exchange is not too difficult and nearly interchangeable, but the top end from the heads, intake system, injection system, and ignition are very different and not even bolt position is similar as to how the TBI intake bolts to the TBI heads as how the Vortec intake bolts to Vortec heads.

You could do a short block swap, but the TBI block has a very mild flat tappet cam which might mess up the Vortec computer as it is expecting a cam with 20 some more degrees of timing compared to the TBI. The Vortec also has a roller cam, some 95 TBI blocks will accept this set up sometimes needing some finish work but the basic provisions are there. An alternative flat tappet cam would be the Edelbrock 3702 which times pretty close to the Vortec roller. The Vortecs front cover would have to be used as would the damper assembly as these have a crank position sensor system that the TBI engine doesn't.The bolt pattern has different details but is easily swapped. The Vortec coolant pump also has to come over because it plumbs differently to the ancillaries and possibly the factory built in bypass which starts to change configuration with the Vortec engine but is inconsistent as to what is there till about mid year 97. As an assembly the Vortec heads, intake, injection, and EGR which includes the exhaust manifold have to be used on the TBI block. Same for distributor.

Done this way has a lot of details to keep track of but unless you get into a flat tappet to roller cam swap there is no unusual machining requirement which that can have if the provisions aren't machined.

Quick reply to this message
  #3 (permalink)  
Old 04-30-2018, 08:41 AM
Registered User
Join Date: Nov 2006
Location: Woodstock
Posts: 1,454
Wiki Edits: 0

Thanks: 55
Thanked 231 Times in 190 Posts
$2000 buys a brand new GM Vortec 350 for the 97.

No way in heck would I purposefully put a 210hp/300tq engine in place of a 255hp/330lb/ft engine that gets much better fuel economy.

Anything can be done though.
Quick reply to this message
Closed Thread

5.7, engines, swap, vortec

Recent Modern Electronic Engines 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:
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:
Please select your insurance company (Optional)


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
vortec to tbi swap Kid1975 Engine 4 01-14-2015 07:35 AM
My TBI 350 Vortec head swap Vader's K1500 Engine 1 06-09-2014 04:15 PM
1992 350 tbi swap vortec stormanormand Transmission - Rearend 9 03-09-2014 01:51 PM
TBI-Vortec swap Q's. matt167 Modern Electronic Engines 21 07-12-2013 06:23 PM
98 350 vortec engine swap 454 vortec engine swap wiring Bobbydnovaman Electrical 0 12-19-2012 11:44 AM

All times are GMT -6. The time now is 12:59 AM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, 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 © 2020 DragonByte Technologies Ltd.
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.