SBC 400 Steam Holes w/L-98 Heads?? - Page 2 - Hot Rod Forum : Hotrodders Bulletin Board -- 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
lost password?   |   register now

LinkBack Thread Tools
  #16 (permalink)  
Old 02-24-2006, 12:51 AM
jakeshoe's Avatar
Last photo:
Join Date: Dec 2004
Location: Texas
Age: 40
Posts: 613
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Many builders plug those 3 holes in the deck of the 400 block because they are prone to cause cracks being so close to the head bolt holes.

It COULD potentially cause cracks in a head also. If they are not drilled you have less potential for the problem because you haven't introduced any machining stress or compromised the integrity of the casting.

Common sense and a simply looking at the design of the block would easily alleviate any doubt as to whether the top 3 holes are needed or not.

Reply With Quote Quick reply to this message
Sponsored Links
  #17 (permalink)  
Old 02-24-2006, 07:01 AM
NAIRB's Avatar Moderator
Last photo:
Join Date: Sep 2002
Location: cimarron, ks
Posts: 1,658
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Drill the holes in the heads and forget it.

Competition engine builders don't need them because the engines are always wound tight.

Street engines that see low RPMs and low water pump speeds need the steam holes.

I am an automotive machinist and technician also and drilling the steam holes for a 400 is just common knowledge. Make sure that you drill the intake side holes at a slight angle so you drill them into the water jacket and not the bolt boss.

Reply With Quote Quick reply to this message
  #18 (permalink)  
Old 02-24-2006, 01:50 PM
chevymastermind's Avatar
drive it like you stole it!

Last journal entry: engine
Last photo:
Join Date: Jan 2006
Location: tacoma, WA
Age: 27
Posts: 185
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
no your wrong
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


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
350 heads to a 400 SBC ??? Rat Fink Jr. Engine 7 06-25-2005 11:45 AM
bowtie heads for sbc Eddie Baker Engine 3 11-08-2003 11:02 PM
sbc heads Jared Engine 7 03-03-2003 07:07 PM
sbc 400 heads CARGUY Engine 1 11-06-2002 04:51 PM
SBC Heads fred56 Engine 4 10-27-2002 07:54 AM

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

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999 - 2012. All Rights Reserved.