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Author Topic: Spark Plug Gap  (Read 18479 times)

Offline 79K20

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Spark Plug Gap
« on: June 11, 2009, 04:24:34 pm »
What is the correct spark plug gap for a '79 350 4BB?

NAPA said 0.060", some old posts said 0.035"-0.045"...

I'm sure this has been discussed numerous times but I can't seem to find a straight answer in old posts. Thanks in advance.
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Offline ccz145a

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Re: Spark Plug Gap
« Reply #1 on: June 11, 2009, 04:49:02 pm »
.035 was for point ign
I use .045.
With an upgraded ign system (high output coil) you can take it to .060.
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1975 C10 Silverado LWB, 454CID, TH400, 10bolt 3.42
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Offline choptop

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Re: Spark Plug Gap
« Reply #2 on: June 11, 2009, 10:42:50 pm »
General rule of thumb for what I have learned is .010 gap for every 10,000 volts
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76 C10 Choptop,76 C10 Swb
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Offline VileZambonie

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Re: Spark Plug Gap
« Reply #3 on: June 12, 2009, 04:57:54 am »
what spark plugs are you using?
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline 79K20

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Re: Spark Plug Gap
« Reply #4 on: June 12, 2009, 08:37:45 am »
AC-Delco, R44T, I think...
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Offline VileZambonie

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Re: Spark Plug Gap
« Reply #5 on: June 12, 2009, 01:44:42 pm »
.035"
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                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10
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