Motor and Frame Mounts - Team Camaro Tech
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post #1 of 16 (permalink) Old Nov 20th, 00, 07:33 PM Thread Starter
 
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I found the magazine that has the motor mounts and frame mounts in it. Super Chevy, June, 1991.

I'm going to jot down here the combinations so that anybody that has a question about this and header interference fit problems might check and see if they do indeed have the correct stuff so their engine will sit right in the engine bay to alleviate header fit problems.

I got scared and bought big block frame mounts after I found out that there were different ones for the various engines just so I hopefully won't have header fit problems.

Mount # 1 --- 1 11/16" thick x 2 " wide at the bolt x .250" metal thickness.

Mount # 1 Engine Vehicle
283 '58/'68 Big Chevy
'64/'67 Chevelle, Chevy II
307 '68/'72 Chevelle, Nova, Monte Carlo
'69/'71 Camaro
'68 Big Chevy
327 '69 All Models
'67/'69 Camaro, ChevyII
'64/'68 Chevelle
'65/'67 Chevy II
'58/'69 Big Chevy
348 '58/'61 All Models
350 '70/'72 Big Chevy-two barrel
'71 Camaro
'70/'71 Nova except special high performance
'70 Camaro except special high performance

Mount #2 --- 2 1/8" thick x 2 3/8" wide at bolt x .187" metal thickness

Mount # 2 Engine Vehicle
302 '69 Camaro
327 '67/'68 Big Chevy
'68 Chevelle
350 '72 Nova
'69/'72 Chevelle, Monte Carlo
'70/'71 Big Chevy
'70 Camaro with special high performance
'69 All Models
396 '67 Big Chevy
'68/'70 Chevelle
'69/'70 Camaro, Nova
402 '70/'72 All Models
427 '68/'69 Big Chevy
454 '70/'72 Big Chevy, Chevelle, Monte Carlo

Mount #3 --- 1 3/4" thick x 2 5/8" wide at bolt x .187" metal thickness

Mount #3 302 '67/'68 Camaro
305 '80 Calif. Only Corvette
307 '68/'69 Big Chevy Police Package
327 '63/'68 Corvette
350 '66/'68 Corvette
'67/'68 Camaro, Chevy II
'65 Corvette
396 All Models
409 '61/'65 All Models
427 '66/'69 Corvette
454 '66/'67 All Models
454 '70/'74 Corvette

Remember, there are six cylinder, small block and big block frame mounts so your engine won't sit stock if you mix engine mounts and frame mounts.

Hope this is of use, the next time somebody says their cheap headers don't fit worth a da-n. pdq67





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post #2 of 16 (permalink) Old Oct 30th, 02, 08:12 AM
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Peter
 
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pdq67,

Do you happen to know the GM part numbers for the 67-9 Camaro BB frame mounts?

Peter
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post #3 of 16 (permalink) Old Oct 30th, 02, 09:09 AM
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69 BB Left frame mount: 3980941

69 BB Right frame mount: 3980942

69 SB 302-350 Left frame mount: 3945507

69 SB 302-350 Right frame mount: 3945508

67-68 SB Left side frame mount: 3955183

67-68 SB Right side frame mount: 3980938
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post #4 of 16 (permalink) Old Oct 30th, 02, 10:06 AM
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Peter
 
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Kurt,

Thanks. Was there a separate frame mount for the 67 and 68 big blocks?

Peter
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post #5 of 16 (permalink) Old Oct 30th, 02, 10:35 AM
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Yes.

67-68 BB Left frame mount: 3912597
67-68 BB Right frame mount: 3912598

This site will help you:
http://ourworld.compuserve.com/homep...aro_engine.htm
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post #6 of 16 (permalink) Old Oct 30th, 02, 11:26 AM
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Tim
 
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I was wondering how there could be two different width mounts (2 1/2 & 2 5/8)
for the same brackets? Or does the 307 and base 327 share the 6 cyl frame brackets?


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[This message has been edited by Trick1 (edited 10-30-2002).]

[This message has been edited by Trick1 (edited 10-30-2002).]
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post #7 of 16 (permalink) Old Oct 30th, 02, 11:42 AM
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Peter
 
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Kurt,

Thanks. David has a great site.

I understand that GM doesn't sell these anymore. I've seen a set for sale on EBay. Do you know if any of the catalogs stock them?

Peter
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post #8 of 16 (permalink) Old Oct 30th, 02, 12:03 PM
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Rick's has them (#EP-6) so I would assume the other houses would offer them also. They are expensive though. Keep an eye on ebay.
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post #9 of 16 (permalink) Old Oct 30th, 02, 12:03 PM
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I noticed when I was rebuilding my engine (when it was out of the car) that the frame mounts are metal and rubber just like the engine mounts. Does this mean they can break too? Is there such a thing as a solid frame mount or should I just weld?
jeff
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post #10 of 16 (permalink) Old Oct 30th, 02, 12:10 PM
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The frame mounts should be solid steel. At least the 69 big blocks are as well as my friends 69 small block.

Jody

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post #11 of 16 (permalink) Old Oct 30th, 02, 12:15 PM
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JefeOsterhead: I thought all the GM frame mounts were steel. Are yours GM or aftermarket?

Coach420: I saw the ones on ebay but it doesn't give part numbers. I'd email him and check the numbers. $25 would be a great deal if they were the right ones.
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post #12 of 16 (permalink) Old Oct 30th, 02, 12:44 PM
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Peter
 
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Kurt,

The 69s have a different number from the 67-8. I wonder why? I thought the dimensions are identical. Any idea if the 69s will work with a 67-8 car?

Peter
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post #13 of 16 (permalink) Old Oct 30th, 02, 01:21 PM
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I believe the difference is because the 67-68 used a short style water pump and the 69 used the long style, therefore the engine and pulleys were moved accordingly.
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post #14 of 16 (permalink) Old Oct 30th, 02, 04:49 PM
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What is the height of the 69Big Block mounts to the top and to the center. I have a set which are only marked on the driver side. The number is very close to the small block number 3958113. Looks like a misprint of 3955183. The mounts are driver's side 1&3/4" from frame to hole center,2&1/2" frame to top of mount. Passenger side 1&3/8" frame to hole center, 2" from frame to top of mount. No number on pass. bracket. What are these brackets?

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post #15 of 16 (permalink) Old Oct 30th, 02, 07:14 PM
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To be clear, I'm calling the part that bolts to the engine the mount, the part that bolts to the frame, I call the bracket.

With GM left side is usually an odd number, right side is even numbered. Of course if a part is reissued later it may have a much later number.
I have frame brackets for a 69 302, RH 3945508 is 1 7/16", LH 3945507 is 1 1/2" from frame to hole.

My 67 327/275 frame brackets are RH -3980938 is 2 1/4", LH -3955183 is 2".

69 high perf frame brackets were lowered to compensate for thicker motor mounts that are interlocking to prevent separation.

Low perf engines in 69 used the older non-interlocking mounts. I suspect the thick mounts were not available in large enough quantity for every engine, or they had a lot of the thin mounts in stock to use up.

I think later on, thin interlocking replacement mounts became available for the low perf and older applications. Energy Suspension makes thin and thick interlocking polly mounts.
David

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