'72 A/C Mounting Bracket question

[R N.]

Hello everyone,

I'm working on a '72 L48 automatic with air car and I'm having a problem installing the compressor into the lower mounting bracket for the A/C compressor. The front part of the lower bracket that attaches to the exhaust manifold broke some time ago and the replacement cast bracket I got from a vendor is different from the original. (See photos) For reference the original bracket is GM casting # 3878222.

The problem is the distance between the front mounting hole and the rear mounting hole of the bracket, the original is approx. 6", while the replacement is 5-11/16". So... the compressor will not fit between these points.

Does anyone know where I can get an original bracket, or if any of the vendors sell the correct one. Has anyone else had this problem? All help is greatly appreciated.

[Joe L.]

Re: '72 A/C Mounting Bracket question

Hello everyone,

I'm working on a '72 L48 automatic with air car and I'm having a problem installing the compressor into the lower mounting bracket for the A/C compressor. The front part of the lower bracket that attaches to the exhaust manifold broke some time ago and the replacement cast bracket I got from a vendor is different from the original. (See photos) For reference the original bracket is GM casting # 3878222.

The problem is the distance between the front mounting hole and the rear mounting hole of the bracket, the original is approx. 6", while the replacement is 5-11/16". So... the compressor will not fit between these points.

Kurt-----


GM #3878222 is the correct bracket part number. So, the "reproduction" is not correctly made. I don't understand how the bracket could work for anybody. In any event, you may need to locate a good used bracket from a source like Pacific Corvette, Contemporary Corvette, etc.

Does anyone know where I can get an original bracket, or if any of the vendors sell the correct one. Has anyone else had this problem? All help is greatly appreciated.

Does the reproduction bracket have the 3878222 number on it?

Another possibility is that you have been sent the 77-82 support instead of the one you need.

[R N.]

Re: '72 A/C Mounting Bracket question

Joe,

The repro bracket does not have the number cast into it. I will check tonight what they are. Thank you for the other info you supplied.

[R N.]

Re: '72 A/C Mounting Bracket question

Joe,

Does the reproduction bracket have the 3878222 number on it?

It has a 4 C (or 0) -199-RC on one side and 3'5'C and F4 on the other side.

I'm going to check with the vender I purchased it from to see if the all measure the same. Thank you agian for your help.