Ford 390 (piston in the hole) - 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 01-13-2003, 04:50 AM
New Member
 
Last photo:
Join Date: Jan 2003
Posts: 13
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post Ford 390 (piston in the hole)

We have a 1968 390 Ford engine that we are assembling and noticed the piston to be .135 in the hole. The old ones had a larger dish than these but were only .050 in the hole. What is the preferred stock distance in the hole supposed to be with a factory deck height?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 01-13-2003, 05:08 AM
mstngjoe's Avatar
Member
 
Last photo:
Join Date: Jan 2003
Location: Oregon
Age: 63
Posts: 593
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

According the the Steve Christ book "How to Rebuild Big Block Ford Engines", the stock deck clearance on a 68 390 was .0005. In other words, damn close to zero.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 01-13-2003, 05:18 AM
New Member
 
Join Date: Dec 2001
Location: chicago,IL.
Posts: 19
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

.050 in the hole would be better than .135.I have yet to mike one from the factory to be at ".0005". You have to deck the block to get it to ".0005".You obviously could not machine the deck that much goatman;so,How about another set of pistons?
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 01-13-2003, 05:41 AM
New Member
 
Last photo:
Join Date: Jan 2003
Posts: 13
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

Thanks for your replies, I think I found the problem. They thought they had a 390 and the block is stamped 352***** I am not a Ford man and didnt look in the book, but they must have the same bore size??
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 01-13-2003, 05:50 AM
Biggarmike's Avatar
Chief Procrastinator
 
Last photo:
Join Date: Apr 2002
Location: Florida
Age: 58
Posts: 358
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

Many FE series castings have 352 cast into the block, left side under the timing cover.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 01-13-2003, 05:51 AM
aka Duke of URL
 
Last wiki edit: Finding vacuum leaks Last photo:
Join Date: Oct 2001
Location: Rockville, MD
Posts: 4,821
Wiki Edits: 1

Thanks: 0
Thanked 0 Times in 0 Posts
Exclamation

All early FE's had 352 cast into the block.

What was the origional bore/stroke? It sounds like you might have a stroker or stroker piston (360/410).
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 01-13-2003, 04:45 PM
mstngjoe's Avatar
Member
 
Last photo:
Join Date: Jan 2003
Location: Oregon
Age: 63
Posts: 593
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

After doing some more checking, Pat Ganahl's book "Ford Performance" lists the deck height clearance at .010-.030, which sounds more reasonable.

I'm guessing the Steve Christ book is mis-printed.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 01-13-2003, 05:31 PM
New Member
 
Last photo:
Join Date: Jan 2003
Posts: 13
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

It appears that 1971 390 uses a different compression height (about .090 difference) They ordered the wrong pistons. The right ones should solve the problem.
Thanks to all who responded.........
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 02:16 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.