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Would like to find a 4 grove pulley set for my 1950 303 Rocket
Planning on running a high output 2 belt alternator and compressor for the AC.
like seen in this picture
If you are able to find one it is probably going to come from a 54 or 55 that had factory AC. As you may already know, they are very rare and expensive. Expect to pay close to $600 for the pair. They originally ran one belt for the generator, one for the power steering and two for the AC compressor. Good luck with your search.
Last edited by redoldsman; February 2nd, 2024 at 05:31 PM.
The 1958/1959 Oldsmobiles with air suspension and a/c is an another place to look.
You will need to machine the counter weight off on the crank shaft pulley of the 1958/1959 engines to make it work on 1949 thru 1956 engines.
Factory air cars 1953/1954 oldsmobiles had such a setup and requires no modifications to use on the 303/324 engines.
Just curious why a 4 groove setup?
They are very rare.
I have a 1958/1959 4 groove water pump pulley. It would need rust repair. You could use a 2 groove crank shaft pulley to supply power and use the other 2 grooves to supply power to something else.
Some 2 groove water pump pulleys are stackable and would use a custom made spacer between the two pulleys for strength.
Your 1950 water pump pulley is two groove so your half way there on that part.
Have a machine shop add some grooves to an existing crank shaft pulley.
Depending on mounting location you might be able to bypass the water pump pulley and drive directly off the crank shaft pulley. Or use a dual groove idler pulley to bypass the water pump pulley all together.
There are options, just need to think out of the factory box.
The reason Olds used two belts to drive the a/c compressor was the limited belt contact surface on the pulley. Most old compressors required at least 2/3 contact on the pulley and these two belts added up come close.
Small high rampage alternator pulleys require more contact surface to prevent slipping.
Parts books that cover 1958 Olds have very good diagrams of belts, pulleys and accessories that might help you visualize the various setups.
February 2nd, 2024, 03:50 PM
