Vortec 5.3l in a '46 panel? - 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 09-14-2005, 02:20 PM
donmlewis's Avatar
Registered User
 
Join Date: Feb 2005
Location: Lubbock TX
Posts: 7
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Vortec 5.3l in a '46 panel?

I am trying to decide on a suitable engine/transmission for a project that consists of a 1946 Chevy panel body mounted on a 1945 pickup frame with a '74 Monte Carlo front end and a '89 Firebird rear end. The frame setup came from a friend's rod project that he lost interest in and the panel body came from a farm without an engine or transmission. I intend this to be a daily driver with considerable long distance driving. I want maximum engine reliability and fuel economy with reasonable power. I have a '74 small block 400 that I believe is rebuildable but I don't think I could get much more than about 12-13 mpg. Another friend has suggested installing a late model Vortec 5.3 to get the benefits of computer control. Has anyone done such a swap or does anyone have any opinions about it or the use of the sbc 400?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 09-14-2005, 02:53 PM
Member
 
Last photo:
Join Date: Mar 2003
Location: Bakersfield, CA
Posts: 397
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Here is a good reading on a setup with semi-computer controlled ignition/injection :-) (carburetored). I am not sure about the mpg with it:
http://popularhotrodding.com/enginem...e/0409em_gmpp/

and here is the part from Scoggin Dickey's site:
http://www.sdpc2000.com/cart.asp?act...fac_catid=3541

I was in the same boat. I got a late model used block LM7 with alum. heads where the crank spun a bearing. I bought used coils-over-sparks, fixed the crank, new sets of bearings and rings for pistons, LS6 corvette camshaft. Now I just need $$ to buy that expensive intake with a MSD controller module.

Good luck with your project!
Denis
'67 Camaro RS
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 09-14-2005, 05:38 PM
Bumpstick's Avatar
Hammer and a torch
 
Last photo:
Join Date: May 2003
Location: Southeast TX
Age: 54
Posts: 1,258
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I have kinda the same issue right here...

Going from BBC back to SBC(2) will have questions...


I have a very nice 5.3ltr with just 34 miles on it and am wanting MPG and performance too but want to retain the computer mild manners also (so the wife can drive it... )

I`ll check the links you provided and please anyone else chime in...
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 09-14-2005, 05:51 PM
Registered User
 
Join Date: Nov 2004
Location: California
Age: 67
Posts: 828
Wiki Edits: 0

Thanks: 27
Thanked 21 Times in 19 Posts
I don't know, but I've got to think 18-20 mpg is doable with a light foot, and a good carb or aftermarket EFI setup. Holley ProJection comes to mind as simple and straightforward. The key is in the gearing. If you use a 700R4, you are factoring the RPM by .7, not to mention the lock up converter will halt that slippage. Using a 29 inch tire (say, 255/65-16) and a 3.50:1 differential, you'll be turning only 1988 RPM at 70 mph. I think with a decent engine package (nothing too radical) you'll do way, way better than 12-13 mpg with that 400 cu in small block.

Pat
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 09-16-2005, 12:06 PM
donmlewis's Avatar
Registered User
 
Join Date: Feb 2005
Location: Lubbock TX
Posts: 7
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks to all for the pointers and suggestions. I like the idea of using the 400 since I already have it and a LM7 from Scoggin Dickey costs about $3,000. But, when I compare specs on both engines (stock) I get
LM7: horsepower is 285-295 hp and torque is 325-330 ft.lbs,
sbc 400: horsepower is 180 hp and torque is ?.
The numbers make the 400 seems amemic.

If I run the 400 with a 700R4 though a 3.55 rear end (what I've got) to a 29" tire, I get a little over 2000rpm in overdrive. That seem pretty good but I don't know where that fits on the torque curve for the 400. Does anyone know where I can get torque specs for the 400? I realize they will change after the engine is warmed over. I also like the idea of an aftermarket EFI, I hadn't considered that. Any other suggestions in addition to the Holley Pro-Jection?
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 09-19-2005, 07:40 AM
Registered User
 
Join Date: Nov 2004
Location: California
Age: 67
Posts: 828
Wiki Edits: 0

Thanks: 27
Thanked 21 Times in 19 Posts
The shape of the torque curve will rely largely on the profile of the camshaft and the ability of the cylinder heads to feed it. But remember, at 2000 RPM, when you press the go button, and the tranny downshifts and disengages the lockup, you'll be at a little over 3000 RPM (with the lockout out, your 700R4 will be at about 1:1 in 3rd gear). Most street motors are doing pretty well at 3000 RPM. The couple that I have built seem to peak at about 4000, but are really coming up on the torque curve even at 2500-2800.

Pat
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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Help! What To Do With These GIGANTIC Dents!? mistermuscles Body - Exterior 14 09-16-2005 05:24 AM
wanted: an answer to a simple question ikeaguirre14 Body - Exterior 4 05-15-2005 07:23 PM
Repair of large dents in roof? rlackey Body - Exterior 9 01-28-2005 10:36 PM
Problem solved, '46 Panel Steering Bluepen Suspension - Brakes - Steering 2 01-20-2005 07:05 PM
Quarter Panel Patch Ron M Body - Exterior 1 07-27-2004 01:12 AM


All times are GMT -6. The time now is 03:46 PM.


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.