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Old 09-04-10, 12:59AM   #1
Bruce
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Default 347 dual pulleys?

Have 1957 GMC with 347 single v belt pulley on water pump and harmonic balancer.I installed power steering box to outside of frame.Now I want to go with dual v pulleys on water pump and harmonic balancer.I don't have a clue what will fit. Thanks to anyone that can help me.
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Old 09-04-10, 10:49AM   #2
tjs44
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Bruce,sounds like it has the HD balancer,they did make dual belt HD balancers,hard to find.I really think a 61 2 pc balancer system will work.I have swaped them for the HD balancers in the past.Tom
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Old 09-05-10, 09:04AM   #3
Bruce
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Thanks Tom,I guess your saying 389 harmonic balancer fits 347. If it does this is the information I'm looking for.Is the bolt holding balancer left or right thread.Oh yes find answers then parts life is good.
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Old 09-05-10, 10:51AM   #4
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yes and righty tighty lefty loosy.Tom
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Old 09-05-10, 01:38PM   #5
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Cool thanks for the help Tom now I can move on to the next step.
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Old 09-05-10, 02:54PM   #6
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might have issues with line up on other pullys though!Tom
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Old 09-05-10, 09:30PM   #7
Bruce
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Oh yes another bridge to cross.I've already switched from generator to alternator so I have leeway there. I think if I get pulleys and harmonic balancer off same 389 it'll fit my 347.If Pontiac didn't make different length water pumps.Tom do you know if someone sells thjs new?Thanks for ya help Tom
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Old 09-06-10, 12:13AM   #8
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they are on the market but dont remember who.Tom
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Old 10-28-10, 08:10PM   #9
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Thanks Tom, I solved it with 1959 pontiac pulleys and hub.
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