max 400 SB overbore? - 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 10-03-2002, 02:14 PM
New Member
 
Join Date: Sep 2002
Location: INDY
Posts: 16
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post max 400 SB overbore?

What is the max overbore on a 400 SB that is safe to reduce cracking overheating etc??

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 10-03-2002, 04:19 PM
NAIRB's Avatar
Hotrodders.com Moderator
 
Last photo:
Join Date: Sep 2002
Location: cimarron, ks
Posts: 1,658
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Post

I don't like to bore a 400 much over .030, if it sonic checks at .145 or more on the thrust side of the cylinder, I'll use it for a competition engine, if it's less, I'll use it for a street engine. If you take it to 4.155", you can get your pistons in .005" increments to freshen up, that's what I do with them. I'll start at 4.155 then go 4.160 and so on until it's in the scrap heap out back.
If you use a Bow-Tie block you can go much bigger with your bore, but the stockers are already stretched to their limit at .030
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 10-03-2002, 04:30 PM
New Member
 
Join Date: Sep 2002
Location: INDY
Posts: 16
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

I am looking at a 400 block that is borded .030 over and they say it has taper that would need to be honed. Sounds unsafe? I dont knwo the casting number yet, but will know by tomorrow I hope
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 10-03-2002, 04:40 PM
NAIRB's Avatar
Hotrodders.com Moderator
 
Last photo:
Join Date: Sep 2002
Location: cimarron, ks
Posts: 1,658
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Post

It's hard to say if it's unsafe. If it's a bunch of taper, then you'll have to hone it to probably 4.165 to straighten it up, so that's .040 and that's about all I would, so buy it cheap!!! You just don't have anymore room to do much with it. Maybe shop for a different block.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 10-04-2002, 02:34 AM
New Member
 
Join Date: Sep 2002
Location: INDY
Posts: 16
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

The block is going for $100.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 10-04-2002, 02:05 PM
New Member
 
Join Date: Sep 2002
Location: INDY
Posts: 16
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

So .040 is OK?
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 10-04-2002, 03:39 PM
NAIRB's Avatar
Hotrodders.com Moderator
 
Last photo:
Join Date: Sep 2002
Location: cimarron, ks
Posts: 1,658
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Post

I think you could get by with .040 depending upon what you want to do with it. If it's a racing type deal, sonic check it, and remember you'll have to probably go with another block if you have to freshen it up sometime or have some problem.
If you go .040 have it honed rather than trying to bore out .010, this will help eliminate spots that won't clean up by improperly centering the boring bar. Use a CK-10 or equivalent machine and use a torque plate. If there are small "eyebrows" where it won't quite clean up after honing, you can run it anyway without any trouble unless it's terribly worn out.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 10-04-2002, 04:17 PM
NAIRB's Avatar
Hotrodders.com Moderator
 
Last photo:
Join Date: Sep 2002
Location: cimarron, ks
Posts: 1,658
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Post

Oh, and by the way, I think a 100 bucks ain't too bad for a 400 block, they are getting quite scarce these days.
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



All times are GMT -6. The time now is 08:21 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.