I am replacing the original compressor in my 72 base engine because it has seized internally due to loss of refrigerant, and failure of the superheat switch and thermal fuse to protect it.

I have received conflicting clutch/pulley information from several vendors regarding the diameter of the pulley, specifically 5-inch versus 5-3/4 inches as my supposed original. The existing pulley - which I believe to be original - is the 5-3/4", but two of three reputable vendors have stated that this is incorrect for a small block. A look in the 1982 parts book was inconclusive.

Throughout my ownership of the car for 39 years, new belts have always been replaced "from the FLAPS book" and each new belt has always fit perfectly. The results were always mid-bracket adjustments and reasonable clearances from the exhaust manifold, rocker arm cover and inner fender. I believe the smaller 5-inch pulley would require a new, non-spec and shorter belt to obtain this same adjustment range.

I am prepared to buy the clutch removal tools to switch the pulley from the original compressor if necessary, while ordering a reman compressor without the solenoid, pulley and hub installed. I intend to retain the old core, which I believe to be original to the car.

Am I correct in assuming the original pulley for the small block is 5-3/4 inches in diameter, or are the vendors correct? I'd appreciate if some 71-73 owners would let me know what is on their cars, too. It is easy to tell - the 5 inch pulley is about flush with the clutch hub, where the 5-3/4 inch pulley "sticks out" from behind the hub.

Best regards and thanks for the help,

Jack

 

I thought I was going to help, but mine seems to be even smaller!

I have a 72 LT-1 with a/c, and it is supposed to have a deep groove pully.

I just tried to measure mine and it looks even smaller than 5 inches. I do have a problem with the belt rubbing on the lower rad hose and have put a guard around it (tin can painted black ).

I do think it is a replacement compressor though. I've been thinking of going to an aftermarket direct replacement Cool Pro S6 compressor
http://www.s6compressor.com/about.html

Wish I could be of more help.

 

Anyone else have something to add, please?

Jack

 

Jack,
Check out www.discountacparts.com.

They list two compressors rebuilt @ about $245.00 including shipping

New about $345.00

information includes pulley sizes.

I have bought from them in the past and they are dependable and fast in shipping .

It was an easy transaction with outstanding results.

 

i also have a 72 base 350 engine, and 95%ish unmolested car.

looking at the AIM, C60/C1, the drawing shows a pulley larger than the front clutch.

here's a couple of photos of mine, not on the car at moment.
pulley is about 5-3/4", front clutch is just under 5"

 

This one is identical to my compressor - green label, larger diameter pulley and all!
Jack

 

I've also reached the conclusion that most of the rebuilt compressors don't have provision for the superheat switch on the rear head. This is why I thought it best to have the original rebuilt, but it is big time $$$.

 

Looks zactly like mine too! :-D

 

Just a thought but how about upgrading to a newer version of the A6 Compressor. You can run the old Freon and the newer what ever it is.

said to be lighter, more efficient and even give you more HP....Okay JK.

http://www.ecklerscorvette.com/corve...1963-1976.html

This is the route I went on my 1973 that the AC had been removed....All new hoses, VIR Drier and what not.



Karsten

 

My '74 L48 w/four speed has the larger pulley, as well. Origional A6 compressor.