Big Block vs. Small Block frame mounts - Chevelle Tech
Engine AdvertisementGeneral Engine Discussion.

 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 4 (permalink) Old Jul 5th, 06, 5:25 PM Thread Starter
 
Join Date: May 2004
Location: Rhode Island
Posts: 23
Big Block vs. Small Block frame mounts

Can anyone tell me the difference between the motor mounts for a big block and a small block on a 1966 Chevelle? I have a pair of small block frame mounts and what I believe to be a pair of big block motor mounts. However I need to use them on a 454. Someone has told me that "technically" the frame mounts are different for a big block but many people have used the SB ones. Apparently the only difference is that the block will sit a little bit closer to the radiator support if I do use the SB mounts. Is this true? If so, how much further will the motor sit towards the front and will this cause problems when I use the stock driveshaft?
dfoisy78 is offline  
Sponsored Links
Advertisement
 
post #2 of 4 (permalink) Old Jul 5th, 06, 6:01 PM
Lifetime Premium Member
Papa
 
Join Date: Oct 2005
Location: 1/4 mile from Arnold, ND
Posts: 1,996
Re: Big Block vs. Small Block frame mounts

This topic has been popular so use Search for more information.

1964-1967
The frame stands for SB and BB are dimensionally the same except the BB stand has an indentation for the motor mount safety lock feature.

The difference between a SB and BB motor mount is the BB mount has the T-lock or safety lock feature.

The BB frame stand will accommodate both BB and SB motor mounts. The SB frame stand will NOT accommodate BB motor mounts because of the safety lock feature.

The frame stand determines the motor mount regardless of engine displacement.

All Chevrolet V8 engine blocks from 1958 up have the same motor mount boss configuration regardless of displacement.

I hi-jacked the picture below. I can't remember the author of the post but they did an excellent job. The BB frame stands are middle of the top two rows.

Last edited by Mr Chevelle; Jul 5th, 06 at 6:14 PM.
Mr Chevelle is offline  
post #3 of 4 (permalink) Old Jul 5th, 06, 6:55 PM Thread Starter
 
Join Date: May 2004
Location: Rhode Island
Posts: 23
Re: Big Block vs. Small Block frame mounts

Would it be ill advised to cut off the "T" lock to get the BB mounts to work with the SB frame stands?
dfoisy78 is offline  
post #4 of 4 (permalink) Old Jul 5th, 06, 11:56 PM
Super Mod
Rich
 
Join Date: Oct 1999
Location: Waverly, NE USA
Posts: 13,752
Garage
Re: Big Block vs. Small Block frame mounts

Quote:
Originally Posted by dfoisy78
Would it be ill advised to cut off the "T" lock to get the BB mounts to work with the SB frame stands?
Yes.

Installing a big block with big block mounts on small block frame stands will result in an engine that sits higher than it would with big block frame stands as well. Some header manufacturers dictate that their BBC headers will only fit if big block frame stands are used so this should tell you something.
Rich-L79 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevelle Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
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. Note, you will be sent a confirmation request to this address.

Email Address:
OR

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.



Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Big Block or Small Block? tmino Bench Racing 47 Oct 3rd, 06 6:30 AM
small or big block Q-Jet hobbiesracer Engine 2 Jun 22nd, 06 9:36 AM
Big block front spring ride height vs small block springs w/big block? ss502 Chevelle Tech 1 Dec 13th, 05 7:33 AM
big block same as small block? 66hardtop Heating & Cooling 4 May 28th, 05 8:50 PM
Replacing frame mounts on 67 big block DaleM Engine 2 Nov 21st, 02 10:31 AM

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

 
For the best viewing experience please update your browser to Google Chrome