Where can I obtain factory GM block blueprints? - 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 07-17-2003, 02:20 AM
Member
 
Join Date: Dec 2002
Location: SoCal
Posts: 46
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Where can I obtain factory GM block blueprints?

I want to have BHJ make up some specialized tooling fixtures for a vintage engine that will become a race engine ('59-64 394 Olds), but they will not do it unless they have factory GM block blueprints with all the spec's and reference points on it (I'm not just talking about what the standard bore size was here, it's more involved than that). I want to locate the factory prints for the '59-64 Olds 394 engines, but would consider any prints for the '49-58 303/324/371 as well. At minimum, I need prints for the block, but will also gladly take prints for the heads, crank, and camshaft as well. Help! Where do I look for such a thing? It seems to me that GM must have an archive of blueprints, because all these reproduction parts companies seem to have no trouble locating factory blueprints, dies, etc. etc. If anyone can help, or offer a useful suggestion, please e-mail me at jec2@gte.net THANKS!!!

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 07-21-2003, 08:36 AM
SAE Member, ASE Master Cert.
 
Join Date: Aug 2002
Location: Twin Lake, MI
Age: 67
Posts: 332
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
The original GM engine blueprints are not available to outsiders. One reason is that the original factory engine prints are drawn to full scale and are very large. Many times the GM engineers have them spread out on the floor or across very large tables. The prints for components purchased from outside vendors, such as crankshaft, pistons, rods, bearings, rings, valves, springs, etc., etc. are available from the manufacturer - IF they have an aftermarket version of the part. The OE production version of the purchased parts are also owned by the OE manufacturer and are very guarded.
I would think that a company like BHJ could reverse-engineer the block measurements and come up with the dimensions needed for your tooling. (That is what off-shore suppliers do to manufacture cheap replacement parts for domestic engines). If not, then maybe a local machine shop could produce the fixture you are seeking.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 07-25-2003, 10:57 PM
Member
 
Join Date: Dec 2002
Location: SoCal
Posts: 46
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks for the reply, engineguy!

It's starting to look like I may do just that-- reverse engineer by taking measurements of all 8 blocks I have here and then taking the most consistent measurement as being what it's supposed to be. Or taking an average if the measurements are all hovering around something.

But BHJ refuses to make fixtures to anything but blueprint. They specifically told me that they do not and will not reverse engineer or take any measurements from a block.

I just wanted to be able to get the lifter bores exactly perpendicular to the camshaft centerline so that the rollers sit flush and not on edge. You wouldn't think it would be that hard...

One other option I am going to start exploring is the possible use of the oh-so-expensive Schubeck radius lifters in the stock .921 size, and getting a custom-cut cam to take advantage of those large-radii lifters, instead of bushing down to a .842 bore and utilizing late roller lifters...

But, as this is ongoing, I would still appreciate any input from anyone on this matter.

After I posted that, I got to wondering where exactly BHJ has acquired the factory blueprints that they say they have for the applications that they do fixtures for currently???

Also-- if anyone knows of a full-service racing engine shop near SoCal that may also be the right shop to make up some "BHJ-style" fixtures for a custom application where there is no blueprint available, PLEASE e-mail me at jec2@gte.net with some leads! Thanks!

Last edited by Blownolds; 07-25-2003 at 10:57 PM.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 08-09-2003, 11:47 PM
Member
 
Join Date: Dec 2002
Location: SoCal
Posts: 46
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Well, an update. After searching the internet, I have found two instances where people have said that the Schubeck radiused lifters failed on them. I suspect it's because the lifters may have slapped back onto the cam after coming off the nose on a radical grind. I hate to be a guinea pig, so I'm in no hurry to duplicate that disaster.

But, the Schubeck flat solid lifters seem to be working for people, and I may be able to get a custom solid cam ground to take advantage of the large .921 lifter size. That would certainly simplify things since I would not need to sleeve the lifter bores. Heck, I don't even need a set of custom Schubeck lifters for that, since I already have a few sets of solid lifters here.

One other option IF I could get a fixture made, might be the possibility of using the Schubeck "Roller X" roller lifters which have a 1-inch O.D on the outer bushing. But same deal, I would need a way of reaming the lifter bore holes perfectly perpendicular to the cam centerline. Not only that, I have been trying to get some feedback from people using the "Roller X" lifters and have not yet found a single person who has tried them. Maybe it's the $900 price tag, who knows.

More and more I'm starting to think that I may try a big custom solid flat tappet cam and see how I like it. I may just use some of these .921 solids I have here on hand. Hmmm...

Any input is still appreciated, I ain't done fishing yet.
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 10:40 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.