crankshaft snout threads - 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 10-08-2003, 12:34 PM
Registered User
 
Join Date: Aug 2003
Posts: 8
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
crankshaft snout threads

what is the size and thread type in the snout of a small block crank? small journal 327 crank specifically. i need to run a cleanout through it.

thanks.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 10-08-2003, 05:39 PM
New Member
 
Join Date: Sep 2003
Location: New Jersey
Age: 33
Posts: 10
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I believe they are 7/16" fine thread.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 10-08-2003, 06:39 PM
Member
 
Join Date: Mar 2003
Location: Indiana
Posts: 296
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
If they are factory they are 7/16 fine thread but many of them never even had snout bolts so doublecheck your bolts with a gage in case someone has drilled and tapped a different size
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 03-27-2006, 07:06 PM
Registered User
 
Last photo:
Join Date: Jun 2005
Location: San Andreas, Ca.
Posts: 28
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
SBC crank snout thread question

Today I had someone (whose automotive opinion I respect) tell me that early small block chevys did not use a center bolt to retain the harmonic balancer, and in fact their crank snouts were not even tapped to receive a bolt.

Although I did not believe this was true, rather than tell him he should stop smoking crack, I searched the archives here to see what I could find out. And lo and behold I found another reference to this oddity.

Quote:
Originally Posted by syclone
If they are factory they are 7/16 fine thread but many of them never even had snout bolts so doublecheck your bolts with a gage in case someone has drilled and tapped a different size
So what is the scoop on this ? If GM in fact did not use a crank bolt on the first small blocks, when did they start using them ? And can a non-threaded crank safely be drilled & tapped for a bolt ?

The reason I'm asking is I went to fit a degree wheel to my '64 327 last night and was surprised to find no bolt there. Not only that, but in this case it looks as if there was a bolt at one time, but it was broken off just below the end plane of the crank, and then Einstein the mechanic tried to drill it out with a dull bit which really made a mess of things. (see attachment)

Any useful advice is greatly appreciated.

Daren
Attached Thumbnails
Click image for larger version

Name:	3-26-06 025.jpg
Views:	80
Size:	56.7 KB
ID:	11214  
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 09:17 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.