"Crank pulley OD 6.75", OE idle speed is 450 rpm but I can bump it up to what the compressor would need." Please remember that if you have the idle set too high on a stick shift that you will have a lot of trouble shifting it...you will get a lot of grinding. Try it ahead of time befo...

Thanks, Tim. Have a great day!

Tim or anyone, working on a 1972 Formula 455 with factory air (which of course includes the A6 and the muffler) and need the oil capacity,
Thanks, Dave

Which engine do you have? The 288 and 327 were of the same block and had 5 mains. The 356 had 9 mains. Granted this is not a car forum, but I have restored the '54 Packard ambulance w/ 288. Be careful of the rearward valves. Cooling back there was sub optimal and you had to stay on top of adjusting ...

I have discussed this case with some other AC guys, and it is possible that a shop that can rebuild the famous GM A6 might be able to overhaul the OEM comp. (which is a semi-hermetic) Or perhaps a shop that overhauls semi-hermetic comps as used commercially such as a Copeland semi-hermetic. Is there...

Well said, Tim.
Hopefully you are not too offended.....
I think he owes you an apology

I see an overdrive relay so you won't be anywhere near 4K RPM

"This forum is highly outdated."
In one man's opinion. If it is so outdated, why bother coming here?
You can resize pics in Paint (Microsoft basic photo editor) with 2 mouse strokes if you don't have a broken hand

Per Bohica, "Engine speed range and drive sizes matter. If you don't have enough compressor volume the system will be awful." Your original engine is a long-stroke low revving engine, typical of the day. All the torque is down low and red line is probably 3K at best. Any more than that and...

Brad or John or Ice there is a new thread on here about a re-engineer of a vintage '53 Packard system which has your name all over it. Possibly you have seen it.
https://autoacforum.com/viewtopic.php?t=14942
Regards, Dave