BBC head chamber volume and other questions - 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 04-15-2004, 07:03 AM
Member
 
Last photo:
Join Date: Aug 2002
Location: Downingtown, PA
Posts: 60
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
BBC head chamber volume and other questions

Hi all! I wanted to see if anyone could tell me what the chamber volume is on a big block chevy 6272292 head. I disassembled my 72 402 last night, and I see that the pistons have a dome, probably 1/8 to 1/4 inch, with a partial relief for the intake valve.

Being that this is a 72 truck motor, with a listed compression of 8.5:1, I expected to see dished pistons, but I suspect that these heads have a rather large chamber volume to bring the squeeze down.

All Mortec or any of the other decoding sites I know says is that the heads have "open" chambers. I'm just trying to figure out what that means.

I have not decided if this motor is going in the Camaro or not, but if it stays I'm trying to decide if I can build it with the parts I have, or whether I need to get different heads or pistons. I want to run pump gas, so maybe this setup is okay. When I saw the factory ratings of 210 HP, 325 ft. lbs., I figured this motor wasn't worth having. But then I remembered that 1972 or thereabouts was the switch from SAE Gross to SAE Net, so maybe this old 402 isn't such a bad starting point.

The bores are calipering as standard, 4.125", and there is only a tiny ridge at the top, so I may be able to get away with a hone job and reusing the pistons. That's why I am asking about the heads, and whether I should try to keep them.

Thanks!
Eric

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 04-15-2004, 07:39 AM
Member
 
Last photo:
Join Date: Oct 2003
Location: Tri-Cities, TN
Posts: 726
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Should be around 119cc. Generally they run big, around 123cc if they are un milled. Do not take this as the gospel. Unless you CC the head, this is just a good educated guess.

Chris
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 04:43 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.