Differences in V8 Frame Mount Brackets and Engine Mounts
All '67-'68 small-block (SB) and '69 307ci and 327ci engines used the same frame mount bracket (approximately 2-1/2 inches wide) attached to the subframe. The 1969 302ci and 350ci engines used a ~3/8 inch shorter and ~1/4 inch narrower bracket. 1967-68 engine mounts will assemble to the 1969 302/350 engine mount bracket, but this is an incorrect assembly that results in driveline vibration and clutch chatter because the engine sits too low and can move on the bracket.
In order to gain engine compartment clearance, big block (BB) engines were offset 1/2 inch to the right (towards the passenger side) by means of asymmetric brackets. 1967-68 BB frame mount brackets are 2-1/2 inches wide (but not the same as SB) and use the same engine mounts as 67-68 302ci and 350ci. For 69, BB frame mount brackets were redesigned to use the new thicker, narrower, engine mount also used by 302ci and 350ci. BBC bracket pairs are easily spotted because the left bracket is noticeably taller than the right in order to achieve the engine offset.
Note that the frame mount brackets and the engine mounts below are grouped together by functionality. The OEM engine mounts may have had different part numbers, but are functionally the same. The original frame mount part numbers are listed.
I added the italics....first paragraph...3/8" shorter bracket...
I'll crawl under the car tonight with a quarter....to see if there is the correct space between the 8" balancer and the sway bar...
The amount of sway bar clearance is not the same if you have a larger than stock sway bar. You may have to shim the sway bar mounting points down to fit a larger bar. I would recommend about 1/4" clearance depending on the type of material your engine mounts are made of.
Also, don't forget to use the correct transmission mount with the right pedestals and mounts. If the engine gets raised in front, and the trans is sitting too low, the engine will be tilted back closer into the firewall, resulting in closing down firewall to distributor clearances.
On this car there is 1.25"-1.4" clearance between the sway bar and the 8" balancer. I didn't mic the sway bar but will this evening. I am fairly sure it's 11/16"....sequel: mic'ed the sway bar and it is 11/16".
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