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Discussion Starter #1
I am looking for an alternator for my 67 galaxie and there are 4 listed:

38 amp
42 amp
55 amp
61 amp

Any suggestions on which one I need for the 390? Napa couldnt tell me which one, other than these are the ones listed for 67 390.
 

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Unless you're doing concurs though, aughta get the highest amp one, especially if you add anything that needs more electricity like a sound sys.
 

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Discussion Starter #4
Great. Thanks for the info. I was just trying to decide which alternator to buy. I have never seen so many options for an alternator before.I think I will go with the 55 since I have no radio.
 

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Match the old one to the new to make sure it mounts the same way and has the same electrical connections. There are different series.

Usually, a re-builder will build to increase output as it will cover more vehicles.
 
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