Motor Mount Brackets - Team Camaro Tech
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post #1 of 3 (permalink) Old May 10th, 01, 05:45 AM Thread Starter
 
Join Date: May 2001
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What are the differences between the big block and small block motor mount brackets. I recently installed a small block in a 69RS/SS convertible which I purchased without a motor.The motor sits about an inch too low and the fan will hit the shroud. I compared the mount towers to my 69 Z28 and they appear to be taller on the Z but they are listed in the parts book as different part #'s so that may not be an accurate comparison. Could this car have big block motor mount towers?
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post #2 of 3 (permalink) Old May 10th, 01, 11:49 AM
 
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Search General Tech and Engines&Drivetrain for "frame mounts" and you'll find many posts on this topic. The short answer is that the big block is mounted lower and more forward. In addition it's offset a bit to one side and one mount is taller than the other so it's tilted.
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post #3 of 3 (permalink) Old May 10th, 01, 12:19 PM
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William
 
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There are two styles of sb bracket. The 1st design is used for the non-interlocking motor mount, 2nd design is used for the interlocking motor mount. 1st design used on all 67-68 sb & 69 307/327, 2nd design used on 69 302/350.

2nd design is narrower & shorter than 1st; unfortunately the non-interlocking mount will fit it. Since that mount is wider and thinner, the engine will be positioned too low and move around, causing vibration and clutch chatter.

My guess is you have non-interlocking mounts on 2nd design brackets. The correct mount is a very tight fit on the bracket.
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