Midyear Horn Identification

[Dale M.]

The horns that are on my car are completely wrong. When bolted to the radiator core support, both of my horns are pointed upwards and fill up with water.

I am looking at another set of horns which we believe aer for a '64, but wanted to be sure that are the correct horns for my car. I have a '64 (March 16, 1964). One horn has a date code of 4C4 (March 4th) and the second horn is dated 4D? (April 1964), a month late for my car. I have not found a complete part number, only 9000 on both horns. From the Judging Guide, I need part number 9000487 & 9000488. Does this number appear anywhere on the horns?

I am not sure about the configuration of the brackets. One bracket positions the horn about 2 inches from the mounting service. Looks more like the right horn bracket for a '63 shown in the Judging guide. But the end of this bracket is not "square ended", but the end of the bracket is cut at a slant. Also the mounting hole is taped with threads. With the angle that the bracket is connected to the horn, there is no way to position this horn to hang down, it would point almost horizontally with the opening pointing toward the left side horn.

The other bracket only positions the horn a small way out from the support, the this bracket is also cut off slanted and it tapped with threads.

Could these be Corvette horns or off of some other GM Model?

I have attached some pictures for reference.

[David L.]

Re: Midyear Horn Identification

Dale,

The horns in your 3rd photo are not 64-67 Corvette because the brackets are for other GM models. The horns you have should have a part number, molded "9000" and stamped "???" right after at another flat area. Use of a small wire brush really helps. The "4C4" date code = 1964, March, 4th week.

The 64-67 Corvette horns with have "9000" (molded) and "487" and "488" stampings. A pair of "early" 64 horns recently sold on Ebay for about $230. The auction (not mine) had some nice photos.

http://cgi.ebay.com/ebaymotors/1964-1967-CORVETTE-HORNS-487-488-_W0QQcmdZViewItemQQhashZitem33660c3235QQitemZ220755407413QQptZVintageQ5fCarQ5fTruckQ5fPartsQ5fAccessories

Dave

[Dale M.]

Re: Midyear Horn Identification

David, thanks. I did not believe these were Corvette horns, but I was not sure just how to identify them correctly.

Dale

[David L.]

Re: Midyear Horn Identification

Dale,

I made a revision in my previous post with a link to some photos on Ebay.

You can convert your current horns to 64-67 horns by changing the brackets. Most original horns have to be rebuilt anyway so while they are apart the brackets can be changed. Corvette Central sells the brackets. I have never rebuilt a horn but I know of others that have.
Good luck,

Dave

[Joel T.]

Re: Midyear Horn Identification

Dale..

If it is of any value, you might check with Dennis Portka from Hamburg NY. He is in Driveline. I needed a correct horn for my 1965 which he supplied and rebuilt the other. He is a good guy to talk to.. He may be able to advise you as to the best course of action.

Good luck,

Joel

[Wayne M.]

Re: Midyear Horn Identification

Dale -- here's some more, dated 4G3 and 4H4, off my early '65.

[Dale M.]

Re: Midyear Horn Identification

Wayne, Great Pictures. Now I know what I am looking for for the numbers on the horns. I may not get numbers matching, but there seems to be a way to make these work for my car. My car is not going for judging, but I try to keep it original as practical and I drive it a few hundred miles each year.

I am also glad that David informed me that I could get the correct attachment brackets to get them to fit my car. I will now start to research on how to rebuild horns. thanks everyone for great responses and advice.

[Keith B.]

Re: Midyear Horn Identification

the brackets look very close to the ones used in my 66 Chevelle

[Dale M.]

Re: Midyear Horn Identification

David, thanks for the information. I will check out getting the brackets and redoing these horns. The ones on my car are way far off, ones not Delco and the other has a larger, more protruding horn and seems to mount hanging down, it also does have any date codes.

[Dale M.]

Re: Midyear Horn Identification

Now that I know where the numbers are I cleaned them up to find them. The horn marked 4C4 is 9000477 and the other horn, 4D1 is 9000473. I was told the the The 9000477 horn is for a 67 Camaro or a 69 Firebird. I not quite sure how the date code is 1964, but they are on a latter model car.

I keep getting more and more information, great group of people, thanks

[David L.]

Re: Midyear Horn Identification

Now that I know where the numbers are I cleaned them up to find them. The horn marked 4C4 is 9000477 and the other horn, 4D1 is 9000473. I was told the the The 9000477 horn is for a 67 Camaro or a 69 Firebird. I not quite sure how the date code is 1964, but they are on a latter model car.

I keep getting more and more information, great group of people, thanks

Dale,

The 1964 Chevrolet used 9000477 (low) and 9000478 (high) horns as per the 64 Chev. AIM.

Is your "4D1" horn stamped "473" or is it really "478"?

The 1967 Camaro used 9000477 (low) and 9000214 (high) horns as per the 67 Camaro AIM.

I am sure your horns were used on other models but I do not have time to look through all my other assembly instruction manuals.

Dave

[Jim D.]

Re: Midyear Horn Identification

April 65 car.

[David L.]

Re: Midyear Horn Identification

Dale,

This website might help you in rebuilding your horns.

Dave

http://temp.corvetteforum.net/classics/l78vetteman//1-15-07/mid_year_horn_rebuild.pdf

[Dale M.]

Re: Midyear Horn Identification

Great article, I am also one that likes to do as much work as possible. I will need to determine how the attaching bracket is fasten to the horn. There are 3 indentions around and I hope is not spot welded. Thanks again

[Dale M.]

Re: Midyear Horn Identification

Dale,

The 1964 Chevrolet used 9000477 (low) and 9000478 (high) horns as per the 64 Chev. AIM.

Is your "4D1" horn stamped "473" or is it really "478"?

The 1967 Camaro used 9000477 (low) and 9000214 (high) horns as per the 67 Camaro AIM.

I am sure your horns were used on other models but I do not have time to look through all my other assembly instruction manuals.

Dave

I believe that you are correct. One side of the 8 did not get struck very well, but with a closer look it looks like an 8. Thanks again. Now the date codes match this usage on a '64 Chevrolet.