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Just got a new AC Delco Ballast Resistor and it has a blue slash mark next to one of the terminals. What does this blue mark represent?:confused0006:
 

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Maybe could mean it passed final inspection...
 

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Can you post a photo?
 

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ballast resistor w/ black dot 58-64 high performance

ballast resistor w/ blue stripe - 58-67 std performance 63-67 Vette without fuel injection 64-65 409 with hydraulic lifters
 

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Don't ask me what the ohms rates are - I'll loose my coveted brownie point.
 

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Hey jwmbishop, can this be used in a 55' stock? tryin to clean up engine compartment and the one installed is all crusty.
 

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Yes the blue stripe is the std perf (most resistance) - I would run it with a High Perf coil - on a stock ign this will wake up the engine.

I would not use the std resistor on a cammed, high comp or dual point dist as you may not have enough spark available.
 

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The blue striped resistor is 1.8 ohms and the black 0.2 ohms. However i have seen many aftermarket resistors with the blue stripe and when measured with an ohmeter have a wide variance on actual resistance. As others have stated the blue is for most std performance engines and the black for high performance ( i think 2x4's & fuelie). The lower resistance gives a hotter spark but will burn your points much quicker. To be sure which one you have regardless of color or markings check it with a meter.

ken 57
 

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Thanks ken - just added the ohm ratings to my notebook!
 
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