pontiac 455 - 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> Hotrodding Basics
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 03-09-2012, 07:08 AM
37 ford
 
Join Date: Sep 2007
Location: Des Moines,Ia
Age: 65
Posts: 13
Wiki Edits: 0

Thanks: 5
Thanked 0 Times in 0 Posts
pontiac 455

Is a pontiac 455 internally balanced or external ? putting in a 4 speed-posi

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 03-09-2012, 07:19 AM
Registered User
 
Join Date: Nov 2011
Location: Virginia
Posts: 705
Wiki Edits: 0

Thanks: 0
Thanked 75 Times in 75 Posts
Yes.


Sorry, couldn' resist... All in fun.

The front "half" of the rotating mass is "internally balanced" (no changes outside the main bulkheads). There IS a slight imbalance in the rear, about 6"-oz. The flexplate has a series of holes all the way around. To one "side', there's an "extra" set of 4 holes, about 1" in diameter, not "reflected" on the opposite side. That's the "change" to bring it "in".

A balance shop can duplicate this imbalance on your flywheel without having to "rebalance" the engine. If a "stock" flywheel and unmodified, it's probably okay "as is", but I would have it checked to be certain.

This applies to all the later Pontiac V8s except the 265/301.

Jim
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 03-09-2012, 06:22 PM
vncruiser's Avatar
Gearhead
 
Last photo:
Join Date: Jan 2012
Location: San Fernando Valley
Age: 56
Posts: 50
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
What is a 4 speed posi?
Reply With Quote Quick reply to this message

Recent Hotrodding Basics 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
428 Pontiac DENCOUCH Engine 14 02-18-2011 02:04 AM
Pontiac CPS help DoubleVision Engine 6 02-15-2011 05:20 PM
need help with my pontiac 301 backyardbuilder Engine 7 08-04-2009 05:58 PM
pontiac 389 or 400 Rufus_2 Engine 3 04-01-2006 03:39 AM
1986 pontiac acaidian with a pontiac 400 mazmanian Engine 2 07-30-2005 01:35 PM


All times are GMT -6. The time now is 04:57 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.