#1  
Old 09-10-2022, 08:50 AM
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Default Cowl vent screws

Picked up new nosr cowl vent screws but they seem tiny.
Can anyone tell me the dia. of shank and washer of an original

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Old 09-10-2022, 07:45 PM
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Some used hex head, some used Phillips head screws. I believe they are #8 sheet metal screws with large diameter fender washers. Color is clear zinc(silver).

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Old 09-10-2022, 08:11 PM
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Interesting everyone is selling the same little phosphate coated screw probably 1/4" hex #6 with a tiny captive washer about 5/16 diameter and I knew they did not look right

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Old 09-11-2022, 08:10 AM
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https://www.bing.com/images/search?v...=0&vt=0&sim=11
Similar to this pic.


Last edited by chrisp; 09-11-2022 at 08:11 AM. Reason: add
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Old 09-12-2022, 11:36 AM
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Quote:
Originally Posted by 72pontiac View Post
Picked up new nosr cowl vent screws but they seem tiny.
Can anyone tell me the dia. of shank and washer of an original
Cowl screw info. This is from OEM cowl vent screws I removed from my never ending 64 GTO project many, many years ago. Car was all original when I bought it.

Specs: hex head, ¼” drive; washer, captive, ½” O.D.; thread length, ½” from the bottom of the washer; thread diameter, 0.1635”, or #8 sheet metal screw. Industry spec for a #8 sheet metal screw is 0.164” (11/16”).

As seen in the pic, some cars used a combo of hex head and Phillips screws. In either case the screw size is #8 sheet metal for all locations. NOTE: Don’t know what year car you’re working on but the specs on my 64 screws obviously different than the aftermarket you referenced.
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Old 09-12-2022, 11:43 AM
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65 and I came up with these. Good enough for the girls I go out with. Thank you for the good information
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Old 09-12-2022, 12:05 PM
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Quote:
Originally Posted by 72pontiac View Post
65 and I came up with these. Good enough for the girls I go out with. Thank you for the good information
That should work as long as the washers fit inside the washer hose retainers if your car has that option. Interesting to note is that my September 69 illustrated parts catalog lists the louver panel to cowl screws as N.S—not stocked. So if needed general sheet metal screws and washers were used.
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Old 09-12-2022, 12:06 PM
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It looks like AMK lists the correct screws - although in a phosphate-oil (dark) finish.

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Old 09-12-2022, 12:09 PM
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Quote:
Originally Posted by 1_Wild_Cat View Post
It looks like AMK lists the correct screws - although in a phosphate-oil (dark) finish.
They are not went to NPD and they weren't right like the stop shops how could they list them as right when they are wrong

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Old 09-12-2022, 12:11 PM
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Quote:
Originally Posted by 64-3Deuces View Post
That should work as long as the washers fit inside the washer hose retainers if your car has that option. Interesting to note is that my September 69 illustrated parts catalog lists the louver panel to cowl screws as N.S—not stocked. So if needed general sheet metal screws and washers were used.
No worries there. 1 speed motor no windshield washers. No seat belts. No back up lights or any courtesy lights except some light.
But it is a real 65 4sp GTO and that is good enough for me
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Last edited by 72pontiac; 09-12-2022 at 12:32 PM.
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Old 09-13-2022, 07:42 AM
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When we reproduced these in 2002, we got samples from many cars with the hex head and they were all the same. We did see some cars with the phillips head screw that were the silver color but didn't choose to reproduce them. We didn't see the two fasteners used in combination on one car. It was either one style or the other. I don't think either of us tracked final assembly plant vs which fastener was used.

We made the hose retainer, and the special screw with the floating washer. There was no fastener available that matched 100% back in 2002. We also had them plated correctly and bagged in sets. Ames is the only company that sells our product, and I believe they add the plastic loop hose fastener with it.
In the 20 years of manufacturing, we have sold about 200-250 sets per year, but once these are gone, that will be the end of it.

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Old 09-13-2022, 07:46 AM
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Do you have a part number for that. I didn't see them on the ames site

  #13  
Old 09-13-2022, 04:40 PM
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Quote:
Originally Posted by Andre View Post
...We didn't see the two fasteners used in combination on one car. It was either one style or the other. I don't think either of us tracked final assembly plant vs which fastener was used...
My guess is that the type of screw or combination of screws may have been dependent on where or when the car was produced.

The pic is from a story about a 64 GTO 8K mile survivor. It was a May build at the Pontiac Plant; hex head on the squirter and Phillips on the retainer. My 64 was a June Pontiac plant build with the same hex head/Philips combo.

I recently picked up a box of miscellaneous parts reportedly from a California car. It had a baggie with two squirters, retainers, and screws. All of the screws were the hex head type.

As we all pretty much know there were inconsistencies among assembly plants as well as different vendors.
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