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The current GM # is 6258154 and I’m only referring to the part that one purchases from a franchised GM dealership that has a regular lineage from GM, not Anchor, Motormite, Doan or Walmart.
If you have any of this GM motor mount could you confirm if it has any initials molded in the rubber.
Example: AU = Goodyear; AY = Firestone: AV = GM Inland Div.
I have some of the referenced part number. I can find no coding embossed on the rubber portion of the mounts as you described. There is the following coding, though:
"330978" or "330973". This may or may not be a GM part number. If either one is, I can't find any record of the numbers.
"2-3"
some sort of symbol that I don't recognize. It's a very small rectangular box with a "wide vertical line" in the center which bisects the rectangular box.
The GM label on the box has the coding "75A0" and "Made in Canada" in addition to the part number, of course.
I was pretty sure that the GM ones were not made by Anchor or Delco. I read someone write on the CF that Delco or GM were made by Anchor, and I was fairly sure that was not true. Anchor is made in Korea and Israel.
Yes, these mounts are DEFINITELY different than those that I've seen that say "Korea" on them. The configuration of the steel components of the mount is different and the steel is thicker.
Re: http://forums.corvetteforum.com/zero...=843081&page=1
Do you think this fellow is blowing smoke about AC Delco as a source for motor mounts?
What about Anchor being the OEM for GM?
Or is he baffling the guy with BS?
It's possible that AC-Delco carries a motor mount that is different from the GM mount. This is just the type of part for which there may very well be differences between GM and AC-Delco.
The GM part, GM #6258154, is NOT available through the Delco parts system. This item is a GM Parts System-ONLY piece. It currently GM lists at $67.55/each.
Although I can find no record of it (not surprising since my Delco parts system resources are much more limited than my GM parts system informational resources), the Delco parts system may have available another motor mount for the 63-82 Corvette application. Since Delco strives to be competitive with AFTERMARKET sources, I would guess that the price of the 6258154 mount (even at much lower Delco parts system margins) would be too great for them to be competitive. So, they may have the "Anchor" mounts packaged in AC-Delco boxes with an AC-Delco parts system only part number.
For years I have had a close relationship with a Delco dealer and never have seen a motor mount in any of those typical Delco boxes. I’d bet $100 there is no such thing as a Delco branded motor mount in a Delco box. For decades I have received Delco product line catalogs, AC, brakes, shocks, plugs, etc and never have seen motor mounts for any car line models in those pages.
Yes, I researched Delco system product availability as best I could and I couldn't find any motor mount for a Corvette, either. So, that's exactly consistent with what you mention and it may well be that there is no Delco system part for this application.
In any event, I'm very confident that the 6258154 is not available through the Delco system and, due to its price, I really don't think that it's the part that was being discussed on the thread on CF.
Geoffrey, about ten or eleven years ago, I bought some motor mounts from Willcox Corvette. They offered me either GM (not AC Delco) or Anchor, and were emphatic that the mounts were exactly the same because Anchor was the supplier to GM. On that basis, I went with the cheaper Anchor mounts. I am pretty sure I gave them the close eyeball when they arrived, and they must have been indistinguishable from the originals. I am not sure if this info fits into this discussion or not.
How do you know the ones you were comparing them too were in fact original GM and not another set of replaCcement Anchor mounts? I will order some GM this week to compare with Anchor. In the past they were quite different and I honestly expect that is still true today.
I am going back further than my memory can be depended on, but I believe I first ordered the GM mounts. They came with yellow GM inventory sticker strips, but had some "hickeys"...as I remember the rubber molding had bridged across the steel bearing plates built into the mounts making them pretty ugly for this perfect trailer queen I was to build.
They were probably perfectly functional, but being the picky SOB that I am, I talked with Willcox about it, and they said send them back. (UPS was much cheaper in those days!) They had previously offered me the Anchor mounts, and I decided to try those. (Or was it the other way around?!! Hell, I don't know; but it seems ALL the mounts I had, old or new, Anchor or GM, were identical in all material respects. )
As for the mounts I compared them to, they were the original mounts that came on the car as far as I know. They probably had 110K miles and 21 years on them at the time, but frankly, I've never replaced motor mounts in my life...well, maybe on a ford once. I think I still have them around here somewhere...if you're not in a hurry, and its important to you, I could be enticed to dig them out and look for part numbers, marks, etc.
What must be kept in mind is that in past decade, a lot has happened regarding offshore sourcing. It's possible that NEITHER GM or Anchor are making their mounts in this country anymore, and cost reducing "improvments" are very likely to have happened.
With respect to the 70-82 style locking motor mounts, there have been 4 different part numbers issued over the years. The first was GM #3980701. This mount was used in PRODUCTION for the 1970-72 model years. It was also available in SERVICE from October, 1969 until July, 1970.
In July, 1970, the GM #3980701 mount was discontinued from SERVICE and replaced, for SERVICE, by GM #3990916. The GM #3990916 is actually a kit which contains one of the 3980701 mounts + long bolt/nut + instructions on how to modify the lower ignition shields on 63-69 model Corvettes to be used with the locking style mount. The 3990916 was never used in PRODUCTION since kits are NEVER used in PRODUCTION. In PRODUCTION, the "bare" 3980701 continued to be used through the end of 1972.
The GM #3990916 continued to be available in SERVICE for 1963-69 (retrofit since the non-locking style mounts were discontinued from SERVICE in 1969) and 70-72 Corvettes until February, 1977. At that time, the 3990916 was discontinued and replaced for SERVICE by the GM #6258154 mount kit (see below).
For the 1973 model year, mount GM #330973 began to be used in PRODUCTION (so, now I've determined what the number which is embossed on the 6258154 mounts I have represents; it IS the part number for the mount, itself). Mount GM #330973 continued to be used in PRODUCTION right through the 1982 model year.
In August, 1972 GM issued, for 1973 SERVICE, mount KIT GM #6258154. This KIT contained one of the 330973 mounts + long bolt/nut. This kit SERVICED 1973+ models. In February, 1977, it also became the SERVICE kit for 1963-72 Corvette models after the 3990916 kit was discontinued. Sometime between August, 1972 and February, 1977 the instruction sheet regarding the ignition shield modifications required to use the locking mount on 63-69 model Corvettes was added to the 6258154 kit.
As can be seen, although there have been 4 different part numbers involved in this, there have been only 2 different actual mounts----the GM #3980701 and the GM #330973. I have an "ample supply" of NOS examples of the GM #3980701, the 3990916 mount kit, and the 6258154 mount kit (which includdes the 330973 mount) [none for sale, of course]. I have carefully inspected these mounts. The only difference that I can see between them is the configuration of the "oval shaped" spacers which are welded to the main frame of the mount and through which the long bolt passes. In the 3980701 mount these spacers appear to be a casting or a forging and the spacers appear to be spot-welded or projection welded to the mount frame. In the 330973, the spacers are fabricated steel with the ends butted together and evidencing an obvious gap. Also, these spacers appear to be MIG-welded to the main frame of the mount instead of spot-welded as the earlier mount.
During the past 15 years, or so, I have never seen an aftermarket mount of any brand or source which was the same as the GM mounts. Most are, of course, similar but there are notable differences in configuration. ALL of the aftermarket types that I have seen in this period just don't seem as "sturdy" as the GM mounts. Of course, I have not necessarily seen every one available. In the "old days" I did see mounts packaged in Federal-Mogul and TRW boxes which did appear to be very similar, if not identical, to the GM mounts, though.
Another interesting point: I have spoken with some folks who use the stock-type mounts in various forms of racing (many racers use solid mounts, but not all do so for a variety of reasons). I have been almost universally told that the GM mounts are the only ones that will hold up, particularly in high torque, big block applications. I have also discussed this with certain folks, inclined to "spirited driving", that have used the non GM mounts for street operation. One fellow told me that he was regualrly having to replace his mounts until he decided to "break down" and pay the high cost of the GM pieces. After he installed those he said that he never had another mount failure.
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