AC retrofit questions Old + New

[ItsRandy]

Originally Posted by clinebarger

They are a GM/Harrison "space saver" "lower cost" replacement for the A6 that came on our trucks untill the early 80s. Im open to any good experience you have had with them?

So an A6 compressor is a "pancake" compressor? I don't have any experience with the R4, there is a guy in Georgia making a BB ac bracket using the R4 compressor I was going to buy. Do the R4 compressors have a high failure rate or short lifespan?