Wrong motor mounts... - Team Camaro Tech
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post #1 of 12 (permalink) Old Apr 5th, 04, 04:30 PM Thread Starter
kcs
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Kevin
 
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I just opened my box of parts and I've got the wrong motor mounts. They are wider than the frame mounts. I ordered them from D&R Classic's. They are #M00100. I have a 68 350. First question: Do alot of you buy parts from D&R Classic's? Next question: I dont get it. I thought the 69's were the narrow mounts? I thought the 68 big and small blocks were the same. HELP!!! Part numbers appreciated!!!

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post #2 of 12 (permalink) Old Apr 5th, 04, 05:41 PM
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No part numbers, but as I remember the lo-po V-8's got the wider perches (307, some or all 327's); the 302, 350, and big blocks got the narrower ones. Sounds like they got you some for a 307/327

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post #3 of 12 (permalink) Old Apr 5th, 04, 05:45 PM
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post #4 of 12 (permalink) Old Apr 5th, 04, 10:45 PM
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The factory frame brackets (mounts) do have the GM part number stamped into them. 350's and 302's used the same frame mounts. The numbers are 3945507 and 3945508 and are stamped right into the mounts. The 307 and 327 take different mounts and Big block take different mounts

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post #5 of 12 (permalink) Old Apr 6th, 04, 11:21 AM Thread Starter
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I did some measuring. My frame mounts are 2 9/16 inches wide at the bolt hole and my motor mount is 3 inches wide at the bolt hole. I give up!!!

kcs
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post #6 of 12 (permalink) Old Apr 6th, 04, 12:24 PM
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I'm confused, why are you giving up? Do you not read any of the responses to your question? The answer is there, and it's very simple!

You need the 302/350/396 motor mounts. You have the 307/327 style which are the wrong width. Swap them for the correct ones and you're done.............

Jody


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post #7 of 12 (permalink) Old Apr 6th, 04, 04:33 PM Thread Starter
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I have the 302, 350, 396 mounts and they don't work. I'm starting to wonder if there is 69 frame mounts or big block frame mounts in the car. According to the parts books, they are the different ones. That's all I can figure.

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post #8 of 12 (permalink) Old Apr 6th, 04, 04:56 PM
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If the mounts are wider than your frame pads, then they are not the 302/350 mounts. D&R is incorrect if they told you they are. Only the low-performance 307/327's got the wider perch.

Jody


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post #9 of 12 (permalink) Old Apr 6th, 04, 04:58 PM
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The factory frame brackets (mounts) do have the GM part number stamped into them. 350's and 302's used the same frame mounts. The numbers are 3945507 and 3945508 and are stamped right into the mounts. The 307 and 327 take different mounts and Big block take different mounts.

I am confused. Why would 350 & 302 mounts be different than the 307 & 327 mounts? Both are small blocks with the same dimensions.
Phil
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post #10 of 12 (permalink) Old Apr 7th, 04, 08:59 AM
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As far as I can guess the 302 and 350's had a larger harmonic balancer. Thus they need more room by the swaybar.

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post #11 of 12 (permalink) Old Apr 7th, 04, 10:06 AM
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As far as I can guess the 302 and 350's had a larger harmonic balancer. Thus they need more room by the swaybar.

If this is the case and there are two different mounts for a SB. Could this also be the cause of why some types of headers have clearance problems around the steering box? Perhaps the header manufacturer designed its headers for a car with the 350 mounts.
Anyone know for sure?
Phil
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post #12 of 12 (permalink) Old Apr 8th, 04, 10:39 AM
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Yes, that is probably happening. Please note that with the 350 mounts denting of the firewall will need to be done if you want to run the Gm style HEI. Your headers should be fine and an 8" balancer will clear a STANDARD small diameter swaybar.

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