1969 Z/28 motor mounts

[69Z28-RS]

I've got several of these mounts and I will take some measurements to go with the photos tomorrow and post them.  
For tonight, I thought I'd share with you all what the Chevrolet Parts and Accessories catalog, 30A, effective October 1, 1970 has for group 0.027   MOUNTING ASSY. - MOUNTING UNIT, Engine (also see group 4.081).   This shows what Chevy was selling across the counter and using in their service department less than a year after the '69 Camaro production stopped.  This catalog covers 62-70 Passenger cars, Chevelles, and Novas, and '67-70 Camaros.
What is interesting to me was that the original type mount posted in photos earlier by a couple of folks with the thick rubber at one end of the thru bolt to hold the engne mounting to the frame stand, seems to have been available in 'mirror' images for the left and right side...?   (Types B and D in the illustrations).

[69Z28-RS]

I have original 3886466 mounts, as well as a pair of original '#3963700blk/3962748green/3972740gold  3974735gold nut and3980701' *(the one with all the PN's molded on the side of the rubber); mine had no paint left, so I'm unsure what pn it was sold as but I'm going to call it 3962748 to be consistent with what I called it in the earlier posts.   I also have just purchased 2 Anchor 2283 parts; they are identical in appearance and all measures to the 3962748 parts.

                                                                           GM 3886466               GM 3962748/Anchor 2283                       *Anchor 2267*             

A.  WIDTH = distance between the fwd                                2-1/2 "                                2-1/2" (-)                                            3"
and aft 'pin hole' (which straddles the frame stand)

B.  THICKNESS =Distance from center                                  1-5/8"                                    2"                                                   1-1/2"
of Pin hole to the block surface (back of mount)

C.  OFFSET  =  distance in plane of block                               1-1/2 "                                1-1/2 "                                              1-1/2 "
surface from the top row of holes in the mount
to the block, and the 'pin hole'  for the engine
retaining bolt.

*   I'm not certain these Anchor mounts are 2267, as I've tossed the boxes and they aren't labeled, but they are what the local auto parts store sold me
for 'small block' mounts (and 2267 is what Anchor shows as 'correct' for small block Chevy V8 - but they aren't correct for the 302/Z28 engine.

**   The width of the frame stands as measure on my car are ~ 2-3/8" ...

***  The Anchor 2283 appears identical to the GM 3962748 part, with exception of the molded PN's on the 2748...

[firstgenaddict]

I knew this had been discussed regarding the BB's however the http://www.camaros.org/forum/index.php?topic=4961.0 went to the L48- Z28 mount as well and I knew Shaugs had a 14k mile 04C ss 350, of which I had requested pics, low and behold...
So yes no interlocking or adapter or misc parts until late may june.








 

[69Z28-RS]

FirstGen..  Thanks for that older reference; it was helpful reading more background.   From all of this, I've gotten the idea that there were one or more changes in motor mount PN and/or configuration thru the '69 production year, so we should try to ascertain when the changes were (I think JohnZ had a post in the thread you refefrenced which identified May, June and maybe August of 69 for changes), and what parts were used when.   The change to the '70 motor mount may indeed have been before the actual '69 Camaro production ceased, so that is still an open question in my mind.

I think the (3" wide) Anchor motor mount that the parts store sold me may have been for the big block; Are the big block frame stands wider (3"?) as opposed to the small block frame stands 2-3/8 to 2.5" width?

[Dave69x33]

I ran across this discussion and referred back to my Jerry MacNeish fact books.  I have edition #1 and edition #4.  The motor mount part number was corrected since edition #1 from 3990519 to 3990918. Sorry for the confusion.

I dug up the 35 mm pictures I took of the components during my restoration (I restored my '69Z from 1995 - 2000 and did not have a digital camera back then).  I took digital pictures of my printed 35 mm pictures of the engine frame mounts 3945507 and 5508.  The part numbers are stamped in to the mounts and best seen after the mounts were clean from sand blasting.  I purchased the newer locking style mount mounts from Rick's 1st Generation back when Rick George owned and operated the store. The motor mounts fit well with no problems.

[69Z28]

Just looking at this post and was curious as to the amount of importance given to the old motor mounts. From a safety standpoint they are worthless correct or no? Were interlocking used at all in the production year? Are owners really using the oem mounts?

[Dave69x33]

Gary,

Good question and a good point about motor mount safety.  I drive my car and occasionally really run thru the gears...you know...to keep the carbon cleared out!!!  I used new locking style motor mounts and will take a hit on show points in necessary.  This will only matter if/when I take my car back to a national Camaro event where I could get it judged again.  PS: My car scored 973/1000 or Gold at the Camaro Nationals back in 2000, and no issues were raised regarding the motor mounts during judging at that time.

If I had a very rare, numbers matching "museum piece" and aiming for a 1000 point show car that was only unloaded from a trailer and driven to a show spot, then I would make every attempt to find NOS, very clean original, or very accurate reproduction non-locking motor mounts.  Remember, the rubber in NOS or clean original motor mounts will have deteriorated and may not be safe for driving the car frequently.

Just my opinion on this.  I respect all Camaro owners for what they use their cars for.  But if we intend to drive them, and drive them hard, please think safety...and don't put any extra "bulges" in your beautifully finished hood!

Dave

[69Z28]

I don't even think I would consider non locking motor mounts at all on anything. When I first got my license in Atlanta, we had a brand new 69 Fathom Green Impala 350, Black interior, black vinyl top, nice car. First time my pops let me drive it by myself I stomped the pedal to the floor and the car made all kinds of noise and kept right on rollin down the road with out my foot on the pedal. Scared the crap out of me. First thing I did was put it in neutral and shut it off. Needless to say, I put the key switch in the lock position and realized I couldn't STEER...scared the crap out of me...again. I kept my composure and reached up and unlock the wheel all the time I had the brake pedal on the floor with both feet. Luckily I was in an empty parking lot, but if I was on the street my first time out with my new Georgia license, I could have made a big mess because Piedmont Road is 3 lanes on both sides and was always loaded with cars.


Never forgot that experience ever. I still like to stomp the pedal to the floor, so going thru the gears to clear out the carbon is something I understand and feel safe doing when there isn't any other cars around me. Safety first. Get those locking motor mounts.

[Edgemontvillage]

I have a set of these motor mounts from my 1969 Z/28 but I'm missing the unique hardware for the drivers side mount and need help with some dimensions to aid my search:

1. Length of the through bolt
2. Diameter and thickness of the flat washer (it appears to be extra thick)
3. Inside and outside diameters of the bright sleeve that passes through the motor mount stop bracket (best view is the first photo)
by




Please post if you have these measurements! Thanks.

 

[firstgenaddict]

Lloyd,
If I am not mistaken HBC is reproducing the parts you are after, HOWEVER... (take in mind I typically preface my statements with AS FAR AS I KNOW, OR FROM WHAT I HAVE SEEN... etc THUS I rarely speak in absolutes.) if you are looking for them for your 02B RSZ I am pretty sure your car would not have this set of parts factory installed. (IF I AM NOT MISTAKEN THESE WERE A MAY/JUNE PRODUCTION LINE CHANGE) Recall letters went out in 1972 for referencing the NTSB requiring the recall and this is when the CABLE RETROFIT and bracket (Often seen on restored cars) were installed.
James 

[x66 714]

Lloyd,
If I am not mistaken HBC is reproducing the parts you are after, HOWEVER... (take in mind I typically preface my statements with AS FAR AS I KNOW, OR FROM WHAT I HAVE SEEN... etc THUS I rarely speak in absolutes.) if you are looking for them for your 02B RSZ I am pretty sure your car would not have this set of parts factory installed. (IF I AM NOT MISTAKEN THESE WERE A MAY/JUNE PRODUCTION LINE CHANGE) Recall letters went out in 1972 for referencing the NTSB requiring the recall and this is when the CABLE RETROFIT and bracket (Often seen on restored cars) were installed.
James 

I think that statement is true on big block cars also...Joe

[firstgenaddict]

I was rereading and I want to be clear...
Lloyd the motor mounts which you picture are CORRECT ASSEMBLY LINE MOUNTS for your car, however the bracket and long bolt spacer washer were a production line change which occurred later in production.

[Edgemontvillage]

I was rereading and I want to be clear...
Lloyd the motor mounts which you picture are CORRECT ASSEMBLY LINE MOUNTS for your car, however the bracket and long bolt spacer washer were a production line change which occurred later in production.

Thanks James, do you know when the stop bracket and related hardware were introduced?

[x66 714]

I had a 05A 396 car here at the house that had 11,998 original miles & that feature wasn't on it....Joe

[Edgemontvillage]

I had a 05A 396 car here at the house that had 11,998 original miles & that feature wasn't on it....Joe

That’s helpful, thanks Joe.