SBC '87 + Cast Iron Heads VS Older intake '55-'86 - 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 03-31-2010, 07:58 PM
Registered User
 
Last photo:
Join Date: Jul 2008
Location: Atlantic ocean
Posts: 247
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
SBC '87 + Cast Iron Heads VS Older intake '55-'86

Don't flame me, But I have searched anywhere here on this forum and google also, but can't seem to find the information i'm looking for

So here's the thing, we have a set of these "swirl" port heads on buddy's 350, came originally equipped I think, and we got a very good deal on Weiand Stelth intake for '55-86' SBC.
Before we run ahead and buy this intake, I would like to ask a few question's here first.

I have heard that you need to modify the 4 center bolt holes in the intake manifold because the bolt holes in the '87 + heads are at steeper angle.

Does any one have the correct information on how i can modify the intake manifold to get it to fit my head's properly.

No changing heads is not an option here.

Monzter.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 03-31-2010, 08:39 PM
ericnova72's Avatar
More for Less Racer
 
Join Date: Jan 2007
Location: S.W. Lower Michigan
Age: 47
Posts: 8,952
Wiki Edits: 0

Thanks: 20
Thanked 376 Times in 345 Posts
Once you have the intake in hand it will be obvious what you need to do. It involves taking a die grinder to the two intake bolt areas of the intake, on both sides below where the carb sits. Bolt angle is 72 compared to 90 IIRC, you have to slot the hole and fab up some angled washers to go under the heads of the bolts. You can buy the washers also, from the intake companies.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 03-31-2010, 08:48 PM
Registered User
 
Last photo:
Join Date: Jul 2008
Location: Atlantic ocean
Posts: 247
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
What are these particular washer's called ?
It would also be grate if you could find a picture of such washer of the internet and post in the thread. So I could get the picture.

Thanks.
Monzter..
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 03-31-2010, 08:55 PM
ericnova72's Avatar
More for Less Racer
 
Join Date: Jan 2007
Location: S.W. Lower Michigan
Age: 47
Posts: 8,952
Wiki Edits: 0

Thanks: 20
Thanked 376 Times in 345 Posts
Quote:
Originally Posted by monzter
What are these particular washer's called ?
It would also be grate if you could find a picture of such washer of the internet and post in the thread. So I could get the picture.

Thanks.
Monzter..
Sorry, never made the swap myself as there isn't an 87+ head worth using, until you get to the real Vortec stuff, as far as I am concerned. I just know the basics of what needs to be done to adapt the intake. try taking a look at Edelbrock's or Wieand's web sites for parts particular to the 87+ heads bolt angle fit.

If you are looking for a performance gain you are wasting your time. If you just want to use an aluminum intake you will have to search for what you are looking for. Sorry I couldn't help you more.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 03-31-2010, 09:09 PM
ericnova72's Avatar
More for Less Racer
 
Join Date: Jan 2007
Location: S.W. Lower Michigan
Age: 47
Posts: 8,952
Wiki Edits: 0

Thanks: 20
Thanked 376 Times in 345 Posts
I found mention of these bolt "bushings" at the Professional Products web site but couldn't find a picture. Weiand and Edelbrock both just referenced grinding the intake to fit, no mention of bolt bushings or angled washers. You may need to go to a speed shop that has master catalogs and just start looking.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 03-31-2010, 09:41 PM
Member
 
Last wiki edit: Ford axle ratio codes
Last journal entry: Rear Suspension
Last photo:
Join Date: Aug 2005
Location: Prattsville
Posts: 6,352
Wiki Edits: 31

Thanks: 2
Thanked 53 Times in 49 Posts
I know that Speedway motors has manifolds listed that say they come with the 'adaptors' to fit them on the newer heads.. and the 'adaptors' should be available seperate..

they are the generic unlabeled manifolds they sell, which I think are Professional products or somthing like that
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 03-31-2010, 10:32 PM
techinspector1's Avatar
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Hemet, California, USA
Age: 72
Posts: 12,591
Wiki Edits: 326

Thanks: 700
Thanked 886 Times in 753 Posts
Quote:
Originally Posted by monzter
changing heads is not an option here.
BULL HOCKEY. Whack your buddy up side the head with a good, stout piece of hickory and bring him to his senses. Even when polished, a turd remains a turd.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 04-01-2010, 10:12 AM
Registered User
 
Last photo:
Join Date: Jul 2008
Location: Atlantic ocean
Posts: 247
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
LoL I see where you're going. but since the engine is only in a Caprice Classic Cruiser that's ok, the engine perform's just ok too around 4500. That's more than acceptable for this particular cruiser.
Thanks.

Monzter.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 04-01-2010, 11:08 AM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Quote:
Originally Posted by monzter
I have heard that you need to modify the 4 center bolt holes in the intake manifold because the bolt holes in the '87 + heads are at steeper angle.

Does any one have the correct information on how i can modify the intake manifold to get it to fit my head's properly.
Enlongating the existing bolt holes of the intake will get you lined up w/the holes in the head.

The washers need to be 18 degrees on the 'bottom' to mate the flange to the "new" bolt angles.

Don't make the slots wider, just lengthen them only as much as needed to get the bolts in w/o binding. Be sure the gasket doesn't interfere w/the bolts. There shouldn't be any problem if you use a gasket that matches the later head.

Good luck.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 04-02-2010, 08:07 AM
BigEd36's Avatar
Registered User
 
Last photo:
Join Date: Nov 2009
Location: Auburn, IN
Age: 65
Posts: 378
Wiki Edits: 0

Thanks: 16
Thanked 38 Times in 34 Posts
The Professional Products part number for the manifold adapter bushings is 52110. They are available from Summit as well as many of the performance parts suppliers. The ones available from Professional Products are made to be used with their manifolds that have a larger opening around the bolt to put their adapter bushings into. You can either machine out your manifold to use these as is, or just machine off the bottom part of the adapter bushings to use the wedge with your manifold as it comes (much easier).

This is how they come from Professional Products:


From the Professional Products webpage, this is how they look in a Professional Products manifold:


This is what you need:


This is how they will go on the manifold:


Here are some that were cut from aluminum on a band saw:


Monzter, this is the webpage where I found this info. http://www.persh.org/pickup/TBI%20Intake%20Manifold.htm It shows all the info you will need about using the aluminum manifold with the 87-95 heads. This page shows using them with a TBI intake, but everything will be the same.

I would recommend getting some bolts with smaller heads than those shown in the pics, those are going to be a real b**** to service. You'll need slightly longer bolts to allow for the extra thickness of the adapters.

Hope this helps,
Ed

Last edited by BigEd36; 04-02-2010 at 09:18 AM.
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
Chev Cast Iron Intake Weight? gas_guzzler Engine 3 03-07-2010 10:18 AM
this is a saver.... GM build codes TooMany2count General Rodding Tech 24 11-23-2009 09:36 AM
Modifying 86 and earlier SBC intake for 87> fierosum Hotrodding Basics 2 02-10-2009 10:10 AM
Building A 302 Chevy Scorpio Shaping Flow Hotrodding Basics 6 01-16-2007 05:55 AM
Are sbc throttle body heads & older block compatable? Rodrunner Engine 2 03-11-2003 03:11 PM


All times are GMT -6. The time now is 11:22 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.