70 Exhaust Bezel Screws?

[Mike F.]

Can someone please tell me which is the correct 1970 exhaust bezel screw to use. At one time or another I've tried using all four of these screws in my exhaust bezels. I'll go to Judging Meet "A" and get a thumbs up, then I'll go to Judging Meet "B" and get a thumbs down. I'll change the screws based on what Judge "B" recommends and then Judge "C" will look at them and recommend another type of screw.
It doesn't matter to me which one is correct, but could the "Powers at be" please pick one and agree to stick with it?

TIA,
Mike

[Joe L.]

Re: 70 Exhaust Bezel Screws?

Can someone please tell me which is the correct 1970 exhaust bezel screw to use. At one time or another I've tried using all four of these screws in my exhaust bezels. I'll go to Judging Meet "A" and get a thumbs up, then I'll go to Judging Meet "B" and get a thumbs down. I'll change the screws based on what Judge "B" recommends and then Judge "C" will look at them and recommend another type of screw.
It doesn't matter to me which one is correct, but could the "Powers at be" please pick one and agree to stick with it?

TIA,
Mike

Mike------


I believe it's the one you have numbered as "2". However, it's possible it was the screw you have numbered as "1". I definitely don't think it was the screws you have numbered "3" and "4".

The 4816192 was once available in SERVICE but it was discontinued in 1986. It was primarily used as a fastener in the windshield molding system of some Chevrolet, Oldsmobile, and GMC models.

[Paul O.]

Re: 70 Exhaust Bezel Screws?

Mike

#2 is the one for a 1970 small head countersunk #4 for a 1972 exhaust bezel.

[Patrick H.]

Re: 70 Exhaust Bezel Screws?

Mike

#4 for a 1972 exhaust bezel.

Agreed on this one, that's for sure.

[Bill S.]

Re: 70 Exhaust Bezel Screws?

Hard to tell the size from the picture but if #2 is the correct screw then depending on the shank size it is either a #6 X (length) w/#4 head or #8 X (length) w/#6 head

[Joe L.]

Re: 70 Exhaust Bezel Screws?

Agreed on this one, that's for sure.

Patrick-------


St. Louis must have substituted this screw for the one specified in the AIM because the screw specified for all 1970-72 Corvettes was the same-----GM #4816192. However, for the 1973 model year the screw changed to GM #9422957. The latter was a PAN HEAD, phillips, #8-18 X 7/8" chrome plated screw. Apparently, St. Louis started using this in 1972, prior to the 1973 model year. I wonder, though, if all 1972's got this screw or only those after some point in the model year?

[Patrick H.]

Re: 70 Exhaust Bezel Screws?

Patrick-------


St. Louis must have substituted this screw for the one specified in the AIM because the screw specified for all 1970-72 Corvettes was the same-----GM #4816192. However, for the 1973 model year the screw changed to GM #9422957. The latter was a PAN HEAD, phillips, #8-18 X 7/8" chrome plated screw. Apparently, St. Louis started using this in 1972, prior to the 1973 model year. I wonder, though, if all 1972's got this screw or only those after some point in the model year?

You guys should ask me these questions when the other two cars are here for me to inspect.
I'll see one of them in a couple of weeks, and I know I'll be photographing this area so I will peek at it.
It's a Sept 71 built car, so that will help.

Patrick

[Mike F.]

Re: 70 Exhaust Bezel Screws?

Ok, I just want to be clear on what the Judges want to see. The #2 screws (I call them countersunk) installed in an original and repro bezel. They don't sit flush and you can get your finger nail under the edges. Is this what they want to see?

[Bill L.]

Re: 70 Exhaust Bezel Screws?

Ok, I just want to be clear on what the Judges want to see. The #2 screws (I call them countersunk) installed in an original and repro bezel. They don't sit flush and you can get your finger nail under the edges. Is this what they want to see?

Curious on this one myself.

Bill

[Joe L.]

Re: 70 Exhaust Bezel Screws?

Ok, I just want to be clear on what the Judges want to see. The #2 screws (I call them countersunk) installed in an original and repro bezel. They don't sit flush and you can get your finger nail under the edges. Is this what they want to see?

Mike-------


I wondered why they would have gone to a panhead screw for 1972-73. This may have answered the question. This type of screw head fitment appears very unprofessional and "crude". A panhead screw, while really not an appropriate or "elegant" solution for attachment of a trim piece like this, at least will appear professional.

The real solution to this would have been to revise the bezels so they had a deeper countersink. I don't understand why they didn't do that.

[Alan S.]

Re: 70 Exhaust Bezel Screws?

Hi,
The bezels from my mid-January built 71 have the pan head screws as fasteners.
They appear to be the same screw as is used for the license plate bezel.
Note the ring left on the bezel by the flat surface of the underside of the pan head, and also that the edge of the drilled hole hasn't been 'broken' as it would have been if a counter sunk screw had been installed.
Regards,
Alan

[Bill L.]

Re: 70 Exhaust Bezel Screws?

Hi,
The bezels from my mid-January built 71 have the pan head screws as fasteners.
They appear to be the same screw as is used for the license plate bezel.
Note the ring left by the flat surface of the underside of the pan head, and also that the edge of the drilled hole hasn't been 'broken' as it would have been if a counter sunk screw had been installed.
Regards,
Alan

Well now this kinda throws a wrinkle in to the thought that the change was in 72 or perhaps late 71.

Love to hear from Terry M regarding the screws on his 70 LT1 bezels.

Bill

[Alan S.]

Re: 70 Exhaust Bezel Screws?

Hi,
With the additional thickness the reinforcement in the area of the screw holes gives the bezel it appears there's enough thickness to drill a countersunk hole if desired.
Also, from the position of the burrs, (back side), it appears the hole was drilled from the front side; so I'd think a counter sink in the hole could have been included if the spec indicated it.
Regards,
Alan

[Terry M.]

Re: 70 Exhaust Bezel Screws?

Well now this kinda throws a wrinkle in to the thought that the change was in 72 or perhaps late 71.

Love to hear from Terry M regarding the screws on his 70 LT1 bezels.

Bill

Long story, but I don't have the car home from convention yet. I/we have yet to make room in the garage.

I do vividly remember those fasteners as being a cluster XXXX. I remember two different style fasteners and one style was so short it almost didn't reach the J-nut. One of the original top fasteners fell out and only remained in place because the exhaust tip was so close to the bezel there was no room for the fastener to move out of the hole.

I'll see if I can get you an answer or photo. Perhaps someone took photos at convention.

[Paul O.]

Re: 70 Exhaust Bezel Screws?

Guy's

Here is how I remember the look and config of that fastener. My earlier vote was made to quickly and was incorrect. The screw head was very near flat across with a outer ring but not a uniform circle. At the base of the shaft it had a slight taper but not to the extent of a normal countersink screw.

Here is a photo I found this one on line with a screw that has many similarities as an original but it is closest I could find to show in a photo of my description.

The screw shown its outer ring is to uniform and it is not as flat as the originals but it does have the shallow taper or countersink to it. That is as close as I could come.

Hope someone posts an original 70 and verifies what I have stated or I am wrong again. When installed an original almost seems to disappear.