I ordered new mounts and got something different. Mine are the larger kind with the numbers and letters 2667 black AHN and 2285 Green. The ones I got are slimmer, yet the bolts line up. Did the 427/390 have a heat shield on the driver side? i bought one.
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Re: 68 engine mounts?
Chester----
I'm not sure that I completely understand your question and the information that you've provided, but here are my comments:
Your 68 was originally equipped with non-locking type motor mounts, GM part number 3886466. This mount also equipped early 69s and was later replaced by GM #3967767, also a non-locking type mount. These mounts were replaced in 1970+ production and all 1963+ service by GM# 3980701, 3990916, and finally 6258154. All of the last three mounts are locking-type, SAFETY engine mounts. These mounts are designed to prevent excessive, torque-induced rotation of the engine should the rubber portion of the mount fail.
It is possible that your engine mounts were replaced at some time in the past with the locking, safety type mounts. These mounts are considerably "wider" than non-locking mounts due to the locking tabs found on either side of the mount. As a matter of fact, the non-locking style mounts were not available from GM after 1970, although some aftermarket companies continued to sell them.
The reproduction mounts which you purchased are apparently the original style non-locking mounts. If you are concerned with originality, these are the mounts you need on your car. These mounts are "narrower" than the safety type mounts.
As far as the inscriptions go on your mounts, these do not correspond to any GM part numbers that I am familiar with. Most likely, they are an aftermarket coding system, but it is possible that they are genuine GM. GM does use a coding system on some molded, vulcanized rubber mounts(particularly transmission mounts) in which there are subtle differences between several different part number mounts. All of the full part numbers are molded on the rubber portion of the mount followed by the name of a color. The particular mount is then identified by a chalk or dye mark of the appropriate color. GM service transmission mounts for 63+ Corvettes, GM#3913498, are seen in this configuration. There are several part numbers on the mount, including 3913498 which is followed by the word "yellow". The part has a prominent yellow mark to identify it. I have not seen this sytem on GM motor mounts, but it may have been used. Also, other aftermarket manufacturers may have used the same system.
Your L-36 was originally equipped with a heat shield on the driver's side motor mount. This was GM #3937887. It may have been removed somewhere along the way.In Appreciation of John Hinckley -
Re: 68 engine mounts more?
The mounts I purchased were from Dr. Rebuild pg 98 or in any of your magazines. The type I had prior to these look to be like the 70-80 mount.(from the picture) My car also had the 66-74 BB "v" shaped AC moutor mount shims.--But my car was not equipped with AC?????? per the tank sticker?? I did receive the 63-69 mount they are showing and the heat shield. Do I still need to use the "V" shaped shim????? My question is what set up do I need?
Sincerely,
Dazed & ConfusedComment
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Re: 68 engine mounts more?
Chester---
The non-locking style mounts that you have purchased and the heat shield are "correct" for your car. As far as the v-shaped shims go, "conventional wisdom" holds that they were used only on AC-equipped cars. However, it is hard to imagine that anyone would have added them to the car. In any event, if you intend to have the car judged, this might be one of those cases where you have to make your car non-original in order to make it "original". I'd leave the shims in place if it were me.In Appreciation of John HinckleyComment
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