safe bore of 292 - 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 09-16-2012, 08:29 AM
Registered User
 
Join Date: Sep 2012
Location: Highland, Il
Posts: 5
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
safe bore of 292

Building a '67 Sportside P/U

Building a 292 Turbo, Injected on E85 and Laughing gas

What is the safe bore of this engine?

Starts with a 3.875

Can it go to 4?

    Advertisement

Last edited by garye; 09-16-2012 at 08:30 AM. Reason: spelling
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 09-16-2012, 09:44 AM
vinniekq2's Avatar
Registered User
 
Join Date: Jun 2012
Location: BC,Canada
Age: 56
Posts: 7,321
Wiki Edits: 0

Thanks: 286
Thanked 703 Times in 679 Posts
are you talking a 60 over 283 or the 292 inline 6?
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 09-17-2012, 09:16 AM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Quote:
Originally Posted by garye View Post
Building a '67 Sportside P/U

Building a 292 Turbo, Injected on E85 and Laughing gas
I'm gonna go out on a limb here and say you're talking about a Chevy inline 6 and not a SBC or FoMoCo V8.

Quote:
What is the safe bore of this engine?

Starts with a 3.875

Can it go to 4?
Very unlikely. You can get a 0.060" overbore safely in most cases, but pushing it to 1/8" is risky and I wouldn't even think about trying it w/o a sonic bore thickness test to see how much material there is in the block- and where the material is located (thrust side of bore or not, for example) due to core shift and manufacturing tolerances.

If this is a drag only deal, you might consider a partial fill of HardBlok to stiffen the block, but even then, at 0.125" over, there's just not going to be enough bore thickness IMHO.

If you're boosting it, forget about pushing the limit of bore size. What you need is a stiff bottom end.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 09-17-2012, 11:25 AM
Registered User
 
Join Date: Nov 2011
Location: Virginia
Posts: 705
Wiki Edits: 0

Thanks: 0
Thanked 75 Times in 75 Posts
Agreed with cobalt327. However, in the '70s, we built a 250 and bored it .125" over and it was fine. A sonic test WOULD show what you need to know.

Just went through a 292 for a work truck. .060" over was the largest available.

Jim
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 09-17-2012, 12:14 PM
Registered User
 
Join Date: Sep 2012
Location: Highland, Il
Posts: 5
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
"Olde Gear Head"

Thanks to all who replied

Yes, it's an L6 not V block

6 sleeves whould be a little extreme but not crazy, RIGHT?

Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 09-17-2012, 09:17 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Quote:
Originally Posted by garye View Post
Thanks to all who replied

Yes, it's an L6 not V block

6 sleeves whould be a little extreme but not crazy, RIGHT?

Is there a reason other than a displacement increase for you wanting to go to a 4" bore?
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
Spread bore manifold & square bore carb? 383SBC Engine 2 04-09-2012 09:21 PM
Spread Bore VS Square Bore Advise daveh Engine 22 01-05-2012 06:35 PM
Edelbrock square bore to spread bore GUITAR1989 Engine 15 08-01-2011 06:04 AM
can you bore a 283 block out to a 4" bore ? Mustangsaly Engine 13 05-01-2007 03:02 PM
Spread bore with square bore carb western star Engine 5 10-28-2004 01:16 PM


All times are GMT -6. The time now is 06:03 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.