I'm adding Vintage A/C to my '56 3100 235 truck next month and need a dual grove pulley. I've started my search but not having much luck. I've posted in the "Parts Wanted" board.
Last edited by MickeyP; 01/02/202610:35 PM.
1956 3100 three speed 6 cyl. Stock with a few upgrades.
The easy way (assuming your a/c compressor has 2 sheaves) is to run one belt around the crankshaft pulley, the water pump pulley and one of the sheaves on the compressor . Then run another belt from the other compressor sheave to the alternator.
Last edited by Bill Hanlon; 01/02/202611:50 PM.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12 '52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!
I have a similar pulley setup that Bill describes. I have a power steering pump and an alternator. I used a double row power steering pump pulley, and a single row alternator pulley.
I have a future project that will have A/C, Power Steering and an Alternator. I am adding a Harmonic Balancer from a 292, it has a 2 row pulley, also available with a 3 row. It needs to shortened a bit to match the 235 dimensions. This will give you the additional pulleys your after.
I used a bracket from POL (Performance On Line). There are several brackets available from Alan Groves Products.
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Trying to drive an AC compressor off the alternator slows it down so much that you won't get much cooling below highway speed. Use a 2 sheave harmonic balancer for a 250 six, and drive the compressor with the front crankshaft sheave. The balancer snout usually needs to be shortened about 1/4" to make the rear sheave line up with the water pump and the alternator. Machine the balancer OD seal surface back the same amount as you shorten the length. Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!
