Attached are pictures showing various GM fan shroud nuts. Would any of the fan shroud nuts shown be considered correctly configured for factory installation on 1967, 1966 or 1965 - 396 Corvettes?
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Re: Fan Shroud Nuts
The correct fan shroud nuts are in the second picture. I have seen three different markings on the outside on top next to the nut. One without a marking ( Plain ), a marking with a dimple, and the third is like the bottom one that is in your second picture. On the bottom of U-nut has a " P " marking or a " G " shaped like a diamond stamped in as a marking. The most popular U-nut on mid-year fan shrouds is the one that has the dimple marking. -
Re: Fan Shroud Nuts
I disagree. The originals had square nuts fastened to the clip. The square nuts were square without deformed corners.
Now, maybe there were various suppliers that differ in design but I only have experience with the configuration I described.Comment
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Re: Fan Shroud Nuts
James I couldn't tell much from your photo but my St Louis built 65 BB (17346) has sharp edged hex nuts with a very visible dimple .Comment
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Region VII Director (serving members in Arkansas, Kansas, Louisiana, Missouri, Oklahoma and Texas).
Original member of the Kansas City Chapter, est'd 07/11/1982.
Member: 1965 and 1966 National Judging Teams
Judging Chairman--Kansas City Chapter.
Co-Editor of the 1965 TIM and JG, 6th and 7th editions.
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Re: Fan Shroud Nuts
The fan shroud nuts on my 400 hp. '67 are exactly like the one shown in Gary Bosselman's photo.Comment
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396 Fan Shroud nuts/clips
Here's a photo taken from Bill Williamson's original 396 fan shroud. Note the hex nut and bump on the clip.Region VII Director (serving members in Arkansas, Kansas, Louisiana, Missouri, Oklahoma and Texas).
Original member of the Kansas City Chapter, est'd 07/11/1982.
Member: 1965 and 1966 National Judging Teams
Judging Chairman--Kansas City Chapter.
Co-Editor of the 1965 TIM and JG, 6th and 7th editions.
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Re: 396 Fan Shroud nuts/clips
Jim,FWIW Tim's 67 Maroon Bowtie candidate had the Hex clips at the Texas Regionals, not the square clips with the dimple as we are used to seeing on 67's. Also, maybe Bill Donovan will chime in this thread on what configuration his clips have on his 396 Bowtie. I think we expect to see, generally, the hex nuts on 65 and 66 cars (and possibly some 67's) and the square nut clips on 67's with the dimple. Happy Holidays! ARAComment
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Re: 396 Fan Shroud nuts/clips
Thank you all - the responders above, the callers and the emailers. What will be interesting is to see how this plays-out on the judging field. A common characteristic for Corvette fan shroud nuts seems to be a "dimple" on the clip regardless of the nut configuration; however, that said, there seems to be some evidence of a square nut without smashed corners and no dimple being used (see picture below - Gene mentioned also). The pictures attached to my original post shows four distinct GM variations of fan shroud nuts, apparently none of which were used on Corvettes.Comment
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Re: 396 Fan Shroud nuts/clips
Yes, I think you will find this type, version was a Tinnerman Corp. product. A major supplier back in the day. Tinnerman Corp has a modern day version with a hex configuration similar to previous shown photos. There are other vendors that I supposed supplied nut clips to GM. They were of a projection weld assembly process, much cheaper to produce. Some of the other ones in those photos were a spot welded assembly. Maybe someone has a GM drawing that should have the method of assembly spelled out.
The photo that James shared with us is I think a projection weld assembly. This type nut clip is not limited to Corvettes. I would be interested to see other original products of the day with anything other than a square nut. If the hex nut is found to be truly original, I think it will also be found to be in quantities of lesser numbers. I would also expect to see some original cars with a mixture of square and hex nut clips.Comment
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