403 motor - 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 10-09-2005, 06:57 PM
Registered User
 
Join Date: Oct 2005
Location: nc
Posts: 6
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
403 motor

yall got tricks to juice up my 403 for 68 cutlass and maby where to find some body parts cheap
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 10-10-2005, 07:08 PM
406 ss monte's Avatar
eat a beaver, save a tree
 
Last photo:
Join Date: Dec 2003
Location: greeneville, tn
Age: 42
Posts: 605
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
i love 403's. i've been told the 455 big block heads will bolt on the small blocks, so if you can find a set with small enough chamber with bigger valves, that would be the ticket. if not find a set of 68-70 350 rocket heads. good aluminum intake & headers, with a cam & stall, it will surprize you.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 10-10-2005, 07:42 PM
Rogers Performance's Avatar
Member
 
Last photo:
Join Date: Feb 2004
Location: Hatboro pa.
Age: 54
Posts: 389
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
You want to use the c heads if you are on a budget or you can use the edlebrocks they flow as good as the c heads but not all runners are equall.

If you are going to build it to race or beat on requaly then you will need good rod bolts or eagle aftermarket rods.You will also need the oil restrictors in the mains to keep the oil in the bottom end.I would also use studs in the block or if the budget allows use the straps or gurdel.

The 403 is what they call a window block so the mains are weaker then other blocks.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 10-11-2005, 09:52 AM
Mustangsaly's Avatar
Member
 
Last photo:
Join Date: Jan 2005
Location: Nebraska
Posts: 1,071
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
do a search there is some good olds 403 info already here. a stock 403 has potential, it has a bigger bore than a BBC . a good set of early 350 olds heads is the way to go (350 olds heads need the head bolt holes enlarged to 1/2" ). The 403 responds well to a bit more camshaft and compression. use earlier 350 heads ('68-'72 will do it, but the '72's are the best) to raise the compression, and an Edelbrock Performer-grind cam (these cams are available from other sources than Edelbrock, who I suspect purchases them from another supplier).

A stock 403 Olds engine has tons of torque. Carbs aren't the problem. The problem is the heads. Their combustion chambers are too large, around 83ccs. This results in a compression ratio around 8.0 to 1. Try to find a set of 350 heads from 1973 or before. This will raise compression enough to even think about HP.

If you add 72 or earlier 350 cylinder heads, your compression will be abound 9.5:1-10:1. It will increase your HP considerably, though you'll probably want to add a cam that can take advantage of that high compression.

forget the 455 head idea unless your pockets are running over with money.


small block olds head info here

http://www.442.com/oldsfaq/ofhed.htm#Heads

http://www.442.com/oldsfaq/ofe403.ht...IDEngineDetail some good Build up info here.

a Good site for 403 Olds and all Olds info http://www.realoldspower.com there a guy on the ROP Olds site in Omaha Ne. goes by Mr. Olds that will talk to you on the phone (super nice guy) and knows his Olds and the 403. Terry FCR PERFORMANCE .com 1 877-215-1800 TOLL FREE
OLDSMOBILE PERFORMANCE PARTS AND ENGINES. We sell Kooks headers Ultra Dyne cams and most other performance parts for Olds.


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


Similar Threads
Thread Thread Starter Forum Replies Last Post
AR RACING 383 Motor 64Duece Engine 27 05-20-2013 01:02 PM
Need Help Trying To Get Motor Dialed In 70SPORT Engine 7 01-14-2006 12:27 AM
350 Motor Mount Options for 53 Chevy JAHamilton Engine 4 08-20-2005 12:09 AM
New motor in!! won't start!! Trav Engine 20 05-06-2004 10:54 AM
I need a new motor in my vw. 72superbug Engine 14 08-21-2003 01:55 PM


All times are GMT -6. The time now is 07:23 PM.


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.