Air cleaner hold-down
Thread Starter
Burning Brakes
Joined: Oct 2000
Posts: 878
Likes: 60
From: Minneapolis, MN USA
Air cleaner hold-down
On a 1970 small block - There is a threaded stud that comes up through the center of the air filter...then a round cover sits on top of the air cleaner and that stud pokes through the center of the cover. I need to know what the size/thread is on that stud so i can buy the proper nut to hold that cover down. Can anyone help me?
Race Director
Joined: Oct 2000
Posts: 12,683
Likes: 3,137
From: Shamong, NJ
The carb air cleaner studs have a 1/4-20 thread, I believe.
Originally, GM used a chrome plated, stamped steel, wing nut on 70 (actually 63-72) air cleaners, not a nut. For 73-81, the same wing nut was used, but it was no longer chrome plated.
The correct wing nut is available from any of the Corvette vendors for about $3.00, or you can probably find a similar chrome wing nut at most auto parts stores or speed shops. A hardware store should have forged wing nuts, which are similar to what GM used from 55-62, but nothing like the 63 up wing nut.
IMO, a wing nut is a lot easier to use and better looking on an air cleaner, than a plain nut.
Originally, GM used a chrome plated, stamped steel, wing nut on 70 (actually 63-72) air cleaners, not a nut. For 73-81, the same wing nut was used, but it was no longer chrome plated.
The correct wing nut is available from any of the Corvette vendors for about $3.00, or you can probably find a similar chrome wing nut at most auto parts stores or speed shops. A hardware store should have forged wing nuts, which are similar to what GM used from 55-62, but nothing like the 63 up wing nut.
IMO, a wing nut is a lot easier to use and better looking on an air cleaner, than a plain nut.
Team Owner
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From: Sitting in his Nowhere land Hanover Pa
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The carb air cleaner studs have a 1/4-20 thread, I believe.
Originally, GM used a chrome plated, stamped steel, wing nut on 70 (actually 63-72) air cleaners, not a nut. For 73-81, the same wing nut was used, but it was no longer chrome plated.
The correct wing nut is available from any of the Corvette vendors for about $3.00, or you can probably find a similar chrome wing nut at most auto parts stores or speed shops. A hardware store should have forged wing nuts, which are similar to what GM used from 55-62, but nothing like the 63 up wing nut.
IMO, a wing nut is a lot easier to use and better looking on an air cleaner, than a plain nut.
Originally, GM used a chrome plated, stamped steel, wing nut on 70 (actually 63-72) air cleaners, not a nut. For 73-81, the same wing nut was used, but it was no longer chrome plated.
The correct wing nut is available from any of the Corvette vendors for about $3.00, or you can probably find a similar chrome wing nut at most auto parts stores or speed shops. A hardware store should have forged wing nuts, which are similar to what GM used from 55-62, but nothing like the 63 up wing nut.
IMO, a wing nut is a lot easier to use and better looking on an air cleaner, than a plain nut.
Melting Slicks
Joined: Aug 2005
Posts: 2,359
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From: Confusion
Seriously, after the original post and the explanation we had to sit through to get to the "wing nut" part of it, you REALLY think he cares about NCRS!?!?!?!?!?!?!
Burning Brakes
Joined: Mar 2006
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From: Lima, OH -- 69 L71 427/435hp
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Race Director
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I guess not and it would have been easier to just go to any car parts store and buy one rather than pounding a keyboard and waiting. But.....
Melting Slicks
Joined: Aug 2005
Posts: 2,359
Likes: 15
From: Confusion
Speaking of air cleaner studs, just got a new toy, 67 Chevelle Pro-Street, and was cleaning the engine compartment and polishing things up, so I removed the scoop on the dual Demon carbs and I found the one air filter was held down by a standard 5" hex head bolt, and the other a nut on the stud. After I removed the nut and the cleaner assembly, this is what I found:
Thankfully the originator of this post didn't find this, it would have sent him into a tailspin!!
Thankfully the originator of this post didn't find this, it would have sent him into a tailspin!!
Last edited by corvetteload; Oct 22, 2009 at 07:55 AM.
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