Spark Plug # and gap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

kombreeze · 07-11-2006, 08:27 PM

I have a 68 327 that I've converted to HEI. The engine is stock but I have the bolt ons Edelbrock performer Intake, 600cfm carb, and headers. She runs great but when I pulled the plugs after I drove her home last week she still had a stock plug with .35 gap. What plugs should be ran and what are the part numbers. Just want her to run nice not trying to be the speed demon. The posi 12 bolt helps me on that.......

oilyrag80 · 07-11-2006, 10:50 PM

Just use stock plugs but gap them at .045

tom71 · 07-11-2006, 10:59 PM

there is a heavy duty truck plug i believe the part number is 1025 or 1042 they are blue in color and work amazing i can get the exact number tommorrow if you want .....tom

**'68OrangeSunshine** · 07-12-2006, 12:57 AM

I'm running Champion 4025 Truck Plugs @ .050 in the 350 in my '71 Jimmy.

kombreeze · 07-12-2006, 02:39 AM

Thanks everyone for your input. What ever parts numbers you can provide would be great. Truck Plugs? Are there different spark plugs for trucks, didn't realize that if thats the case. If so whats the dfference?

kombreeze · 07-12-2006, 02:40 AM

Tom that number on the plugs would be great....

**'68OrangeSunshine** · 07-13-2006, 01:30 AM

I used to run Champions for maybe 25 years, but since they went to Mexico their quality has gone south too. The Truck Plugs were a heavy duty plug that had a 3 year warranty - regardless of mileage. I put my last set of US-made Champs on the 350 in May, today a mechanic had to replace my #8 plug (from that batch) with an AC R46TS to pass emissions.
Had to go to ACs on my fresh L6 292 also last year, the Champs wouldn't cut it.

tom71 · 07-15-2006, 09:42 AM

4025 those are the plugs

makovai · 07-15-2006, 10:44 AM

1 word........3 letters
NGK

*72CSTC5* · 07-15-2006, 11:15 PM

So what gap does the general population here go with. Everyone answered between .035 - .050

krue · 07-16-2006, 12:12 AM

Most sources I've seen say 0.045 for HEI

*72CSTC5* · 07-16-2006, 12:20 AM

Thanx Krue.

07-11-2006, 08:27 PM	#1
kombreeze Registered User Join Date: Jul 2006 Location: Fresno, Ca Posts: 154	Spark Plug # and gap I have a 68 327 that I've converted to HEI. The engine is stock but I have the bolt ons Edelbrock performer Intake, 600cfm carb, and headers. She runs great but when I pulled the plugs after I drove her home last week she still had a stock plug with .35 gap. What plugs should be ran and what are the part numbers. Just want her to run nice not trying to be the speed demon. The posi 12 bolt helps me on that.......

07-11-2006, 10:50 PM	#2
oilyrag80 Registered User Join Date: Jul 2006 Location: Tucson Az Posts: 1,695	Re: Spark Plug # and gap Just use stock plugs but gap them at .045

07-11-2006, 10:59 PM	#3
tom71 what happened to flint mi Join Date: Oct 2005 Location: san diego Posts: 437	Re: Spark Plug # and gap there is a heavy duty truck plug i believe the part number is 1025 or 1042 they are blue in color and work amazing i can get the exact number tommorrow if you want .....tom __________________ 71 swb 2wd fleet frame off in progress 72 4x4 blazer daily driver 70 olds cutlass s mint condition owned by a grandma 56 gmc 2wd project waitng 97 fiance mobile

07-12-2006, 12:57 AM	#4
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,104	Re: Spark Plug # and gap I'm running Champion 4025 Truck Plugs @ .050 in the 350 in my '71 Jimmy. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.

07-12-2006, 02:39 AM	#5
kombreeze Registered User Join Date: Jul 2006 Location: Fresno, Ca Posts: 154	Re: Spark Plug # and gap Thanks everyone for your input. What ever parts numbers you can provide would be great. Truck Plugs? Are there different spark plugs for trucks, didn't realize that if thats the case. If so whats the dfference?

07-12-2006, 02:40 AM	#6
kombreeze Registered User Join Date: Jul 2006 Location: Fresno, Ca Posts: 154	Re: Spark Plug # and gap Tom that number on the plugs would be great....

07-13-2006, 01:30 AM	#7
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,104	Re: Spark Plug # and gap I used to run Champions for maybe 25 years, but since they went to Mexico their quality has gone south too. The Truck Plugs were a heavy duty plug that had a 3 year warranty - regardless of mileage. I put my last set of US-made Champs on the 350 in May, today a mechanic had to replace my #8 plug (from that batch) with an AC R46TS to pass emissions. Had to go to ACs on my fresh L6 292 also last year, the Champs wouldn't cut it. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.

07-15-2006, 09:42 AM	#8
tom71 what happened to flint mi Join Date: Oct 2005 Location: san diego Posts: 437	Re: Spark Plug # and gap 4025 those are the plugs __________________ 71 swb 2wd fleet frame off in progress 72 4x4 blazer daily driver 70 olds cutlass s mint condition owned by a grandma 56 gmc 2wd project waitng 97 fiance mobile

07-15-2006, 10:44 AM	#9
makovai Senior Member Join Date: Feb 2006 Location: oregon city Posts: 335	Re: Spark Plug # and gap 1 word........3 letters NGK __________________ If it aint broke..............fix it till it is. www.fast77.com 1972 - 330 hp crate, 11" lift with 39x18 mickeys. 3/4 ton, cross steer, 4 wheel disc brakes 1996 Z71 w/ 35's

07-15-2006, 11:15 PM	#10
72CSTC5 Account Suspended Join Date: Nov 2004 Location: Deer Park, Tx. Posts: 2,524	Re: Spark Plug # and gap So what gap does the general population here go with. Everyone answered between .035 - .050

07-16-2006, 12:12 AM	#11
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,450	Re: Spark Plug # and gap Most sources I've seen say 0.045 for HEI __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

07-16-2006, 12:20 AM	#12
72CSTC5 Account Suspended Join Date: Nov 2004 Location: Deer Park, Tx. Posts: 2,524	Re: Spark Plug # and gap Thanx Krue.



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