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Old 05-06-2004, 01:09 AM
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Spark gaps

SBCHEVY with an HEI distributor and a Mallory 50 000 volt coil with a performance module. Accel Spiral Core wires. Accel 276s plugs.

What kind of spark gap should I run with this? No emissions testing. But I have had plug fouling problems before.

What about the gap after I install my MSD 6A box?

Some of you help me out here please.
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Old 05-06-2004, 05:40 AM
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I would go .045. Someone correct me if I am wrong, but I don't think the 6a box will require a change.
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Old 05-06-2004, 06:32 AM
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plugs

I noticed in you name you have 1971. I am assuming you have a 1971 car.( maybe thats the year you were born??? Just kidding) If you do, and converted it to the hei set up you need to make sure you have 12 volts to the distributor.

Spark plugs need to reach 750 degrees to be self cleaning. If you have problems you may need to step up to the next hotter plug. Make sure you fix the 12 volt deal first if it's not right. If you used the factory wire and only have 6 volts to the distributor this will cause plug fouling.

As far as the msd goes i have found that they like a tighter plug gap. It' not much difference on a NA motor but it really helps on a nitrous motor to close the gaps up. I run mine at .025 You can play with this some and see what works best for you.

I personally don't like the accell plugs. This is just my own findings and i don't want to start a flame job or anything but i Have used the accell's and also the autolite racing plugs and i think the autolite's are a much better plug and they are half the cost.

Keith
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Old 05-06-2004, 09:09 AM
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1971 is not the yr of my car NOR the year I was born. Rather, it is the birth yr of my lovely young wife.

Interesting about the 750 degree thing. I never knew what temp they needed to be. So do you have a no. of an Autolite plug to recommend to me? I just used the Accells because they are a short plug and they clear headers better. Maybe there are other short plugs out there tho. I dunno. By the way Keith I notice that under your name it says Jesus Saves I like that. Another thing, The K in my name stands for.... KEITH too.

So if I have my plugs set at 40 thou will I be ok? with and without the MSD hooked up?
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Old 05-06-2004, 10:58 AM
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Gap??

I just recently installed an MSD-6A HEI upgrade on a '67 Chevelle SS. If my memory serves me correctly, sometimes it don't , MSD called for a .050 - .060 gap, or was it .055 - .065, at any rate is was larger than the normal .045 w/HEI.
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Old 05-06-2004, 11:15 AM
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plugs

keith (1971)

Boy i thought one of the 2 guesses would be right.. L.O.L. Thats why i don't gamble........

.040 will be ok It's not that the gap won't work, just some motors like it tightened up some. Try playing with the gap and see what happens.

If memory serves (and sometimes it don't) those accell 276's are a 5/8 reach tapered seat plug. If so i would get the autolites AR135 to replace them. This would be the starter plug to work up or down from..... Most big chain auto parts stores stock them or can get them in a few days..... The Ar plugs are short like the accell's


Wild bil, I think you are right about msd's paper setting for the plugs. But who reads the directions anyway???? Just kidding. In my dually with a msd box on i set the plug gap to what the paper stated and ran like that. I never tried any different settings on that.....But i should to see if i get any better mpg.
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