67 Original engine motor mounts

[Fred Y.]

Members, after removing & cleaning my 427's engine motor mounts, one reads 2285 with 2290 directly under that #. Do these sound original. I see no part # mention in the JG. They're in great shape----Does anyone have a pic to confirm that mine are original ?
BTW, all 6 bolts have the 6 hash marks (ie grade ) with NO Head marks per manual.

Thank you

[Tom D.]

Re: 67 Original engine motor mounts

Fred: I don't think the 390 HP 427 mounts differ from the 327 engine mounts. UPC = 6 and Sheet B5 in the assembly instructions (AIM) lists part number 3886466. I have some mounts that came from a low mileage '67 with the 390 HP 427, but I have no way to prove they were original. I will attempt to photograph them soon.

I looked again at the L36 (390 HP) sheets in the '67 AIM, including the "components not illustrated for this option" page, and I did not see a second different part number called out for that option.

[Fred Y.]

Re: 67 Original engine motor mounts

Hi Tom, My engine is actually a 435, but there is no difference I'd say Vs a 390 HP----Just trying to verify if the one's I have are the originals----

[Tom D.]

Re: 67 Original engine motor mounts

Fred: These both have the GM number 3980701 on them. I referenced these in a previous comment.

Also note: https://corvetteparts.com/catalog/en...eous?itm=Mount

The above site mentions 3967767 as the mount for '63-'69 Corvettes. A "non-Locking style".
The above site also mentions mine (3980701) as the mount for '70-'82 Corvettes. A "Locking safety style". This one holds your engine from jumping around, should the rubber break.

[Fred Y.]

Re: 67 Original engine motor mounts

Got it Tom. Mine are quite similiar,except mine do not have the inner support washer /reinforcement. Any other info out there?

[Tom D.]

Re: 67 Original engine motor mounts

See my edits, made while you were typing the question just above. My conclusion is that the pictured mounts had been replaced before I got there.

[Justin S.]

Re: 67 Original engine motor mounts

Fred,
The numbers you mention are Anchor/Doan part numbers I believe

[Fred Y.]

Re: 67 Original engine motor mounts

Understood. Any pics out there of originals?

[Joe L.]

Re: 67 Original engine motor mounts

Members, after removing & cleaning my 427's engine motor mounts, one reads 2285 with 2290 directly under that #. Do these sound original. I see no part # mention in the JG. They're in great shape----Does anyone have a pic to confirm that mine are original ?
BTW, all 6 bolts have the 6 hash marks (ie grade ) with NO Head marks per manual.

Thank you

Fred------

What you have are likely Anchor #2285 motor mounts. If so, these are a locking style motor mount so you absolutely know they're not original as original motor mounts for 1963-69 Corvettes were non-locking type. However, while non-original, I recommend the use of locking type motor mounts for all 1963-69 Corvettes. In my opinion, damage that can be caused if a non-locking style mount fails outweighs originality considerations.

Original mounts for your application often have the part number, GM #3886466, embossed on them. These were discontinued almost 50 years ago. If you want to see, generally, the configuration of an original engine mount, check out an Anchor #2249.

[Fred Y.]

Re: 67 Original engine motor mounts

Thanks Joe, I will do so on both items. I see that LIC sells what they call the "most correct" to originals. I'll compare the 3. I have yet to see a pic of an original as most of those were probably tossed by owners.

Thanks Men----

[Jim D.]

Re: 67 Original engine motor mounts

I wouldn't even consider non-locking mounts, judging or not. Some spirited driving with a broken non-locking mount equals - best case scenario is a destroyed fan and shroud, worst case is a stuck throttle and a destroyed car.

[Fred Y.]

Re: 67 Original engine motor mounts

Come on Jim, I never take her past 2500 on the Tach---LOL---NOT !!!

Totally agreed---Thanks everyone.

[Patrick H.]

Re: 67 Original engine motor mounts

FYI, if you want a locking mount that FITS then get the one that Corvette Central came out with for 70-82. Any other currently available OTC mount will not fit, and will require reworking.

The CC one fits well; I've installed a set myself.

I see that their website shows "correct" non-locking as well as locking ones.

http://www.parts123.com/corvettecentral/partsort.pta?catalog=cadefibG&pagesize=50&page=1&addcat=30&subcat=30CQ&_ga=2.199352686.1541042739.1500082309-1749866464.1488760674

Patrick

[Joe L.]

Re: 67 Original engine motor mounts

FYI, if you want a locking mount that FITS then get the one that Corvette Central came out with for 70-82. Any other currently available OTC mount will not fit, and will require reworking.

The CC one fits well; I've installed a set myself.

I see that their website shows "correct" non-locking as well as locking ones.

http://www.parts123.com/corvettecentral/partsort.pta?catalog=cadefibG&pagesize=50&page=1&addcat=30&subcat=30CQ&_ga=2.199352686.1541042739.1500082309-1749866464.1488760674

Patrick

Patrick------


These look good and I expect they're the best thing out there. The fact that they fit without re-work is, of course, a BIG plus. However, they are not exactly correct in every feature of configuration. There were only 2 motor mount part numbers used over the 1970-82 period. The first was GM #3980701 used from 1970-72 and the second was GM #330973 used from 1973-82. In SERVICE these mounts were sold under GM #3990916 and 6258154. That's because these were supplied as part of a kit which included fasteners and instructions.

The 3980701 and earlier versions of the 330973 used spacers which were of cast iron or forged steel and were projection welded to the frame of the mount. Later versions of the 330973 used spacers which were fabricated steel and mig welded to the frame of the mount. This is the configuration seen in the CC reproduction. I don't think this style was ever used in PRODUCTION, but it is possible that it was used very late.

Another difference is the configuration of the locking tab. Both the 39809701 and 330973 had tabs with tapered ends and bent down at about a 10-15 degree angle.

Note photos below of NOS originals:

[Joe L.]

Re: 67 Original engine motor mounts

Photos of another NOS original: