Correct Spark Plug Gap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sweet72_chevy · 06-10-2007, 10:40 PM

I have a 72 chevy c-10 with a 427 ci engine from a 69 impala i was wonderering if anyone possibly knows the correct gap to use on the plugs.

thanks for any help,
George

72 CustomCamper · 06-11-2007, 12:49 AM

If you're still using the points setup .035 ...

Chuck

dubs68SWB · 06-11-2007, 12:54 AM

It really depends on your ignition system. Points are around .035 and HEI is around .045. If you are running something like a multiple spark discharger....like MSD, it can be .050 to .060 and higher. A lot of it, with MSD, depends on your compression ratio. Hope this helps!!

sweet72_chevy · 06-11-2007, 08:28 AM

alright i will probly go with somthin around .050 then b/c i have a msd distributor and coil.

rhanks for your help
george

dubs68SWB · 06-11-2007, 10:11 AM

That gap is only for the MDS multiple spark discharger!!! If you are just running the distributor and not the box, like a 6AL, that might be too much gap and it will make your ignition system work too hard. You really need to check with MSD to see what they recommend.

06-10-2007, 10:40 PM	#1
sweet72_chevy Registered User Join Date: Nov 2006 Location: Westbury Ny Posts: 14	Correct Spark Plug Gap I have a 72 chevy c-10 with a 427 ci engine from a 69 impala i was wonderering if anyone possibly knows the correct gap to use on the plugs. thanks for any help, George

06-11-2007, 12:49 AM	#2
72 CustomCamper huh ??? Join Date: Nov 2002 Location: Fredericksburg,Va. Posts: 3,369	Re: Correct Spark Plug Gap If you're still using the points setup .035 ... Chuck __________________ 90 Blazer Silverado 350w/ 700R4 and 32" Kelly's "I am a bomb technician. If you see me running try to keep up!"

06-11-2007, 12:54 AM	#3
dubs68SWB Registered User Join Date: Feb 2007 Location: Bend, OR Posts: 110	Re: Correct Spark Plug Gap It really depends on your ignition system. Points are around .035 and HEI is around .045. If you are running something like a multiple spark discharger....like MSD, it can be .050 to .060 and higher. A lot of it, with MSD, depends on your compression ratio. Hope this helps!! __________________ '68 Chevy SWB with 460 BBC Muncie M-22 and Eaton posi rear w/ 3.73's Corvette rallys with mini derby caps Sick horsepower and torque

06-11-2007, 08:28 AM	#4
sweet72_chevy Registered User Join Date: Nov 2006 Location: Westbury Ny Posts: 14	Re: Correct Spark Plug Gap alright i will probly go with somthin around .050 then b/c i have a msd distributor and coil. rhanks for your help george

06-11-2007, 10:11 AM	#5
dubs68SWB Registered User Join Date: Feb 2007 Location: Bend, OR Posts: 110	Re: Correct Spark Plug Gap That gap is only for the MDS multiple spark discharger!!! If you are just running the distributor and not the box, like a 6AL, that might be too much gap and it will make your ignition system work too hard. You really need to check with MSD to see what they recommend. __________________ '68 Chevy SWB with 460 BBC Muncie M-22 and Eaton posi rear w/ 3.73's Corvette rallys with mini derby caps Sick horsepower and torque



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