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This is somewhat of an answer and poses more questions. I've been searching the VMF archives for info on motor mounts. It seems like all the Repos are inferior to the originals (according to a lot of VMF guys) and I've read several posts, some VMF'ers report that they have drilled the MM and Installed 1/2" bolts.
I notice the exploded drawings in the 66 shop manual show the HI PO mount has a bolt thru it with (what appears to be a rubber)donut on the top and then a nut. Is the donut rubber?, does it act as a vibration damper for the bolt? The bolt in the HIPO MM is there because it is 3 separate pieces.
I have the 66 type MM with the single bolt thru horizontally connecting to the support, As seen in fig. 15 on page 8-57 of the 66 ford shop manual.
In order to keep from replacing MM's constantly,(due to poor quality repos) drilling a hole and installing a bolt sounds like a good Idea for the 66 MM. Does anyone have anything to report on this type of modification to the 66 stock V8 MM?
 

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It sounds as if you have the "65" type mounts. The "66" type are the "ear" type, instead of one bolt they have two metal flanges on the end.

Many VMFers that have the 65 type do the drilling and bolt treatment and then never have a problem after that.

John Harvey
 

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No it sounds like the 66 mounts not the 65. He said the one bolt was horizontal, which would go through the ears you mentioned.
 

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Ah, I think you are correct. The 66 mounts are much more difficult to modify simply because there is not much room. On Mustang Steve's board a week or so back someone was attempting to modify a 66 mount with a bolt through support. It involved contersinking and thin heads I believe. Anyway, one could go there and search out the post and see what their options were.

John Harvey
 
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