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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: 79K20 on June 11, 2009, 04:24:34 pm

Title: Spark Plug Gap
Post by: 79K20 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.

Title: Re: Spark Plug Gap
Post by: ccz145a 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.

Title: Re: Spark Plug Gap
Post by: choptop 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

Title: Re: Spark Plug Gap
Post by: VileZambonie on June 12, 2009, 04:57:54 am

what spark plugs are you using?

Title: Re: Spark Plug Gap
Post by: 79K20 on June 12, 2009, 08:37:45 am

AC-Delco, R44T, I think...

Title: Re: Spark Plug Gap
Post by: VileZambonie on June 12, 2009, 01:44:42 pm

.035"