What Spark Plugs to Use? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

MandarinSixSeven · 09-02-2002, 03:25 PM

I'm just about to go out and buy some new Plugs, i was told that since Ac Delco are what would have come on these trucks, then they are the ones that would most likely be the best, since GM vehicles are made to use AC Delco...what are your thoughts on this? ...i mean it makes sense to me, but, are there any reasons to not believe this?

Mountain Man · 09-02-2002, 04:17 PM

You can use what ever brand you like. There are lots of good plugs out there, Bosch, Champion, etc. I have tried them all, and the ones that actually did feel a bit more responsive, and the ones I run, are the AC Rapid Fires. I use .045 gap for my 355

Jmac05 · 09-03-2002, 09:56 AM

Make SURE The ones you get are the right ones. I was getting all new plugs and wires, and the friggin' idiot at the Autozone gave me plugs way too long, and I almost cracked a piston! Double check the new ones against the old ones.

justin · 09-03-2002, 10:43 AM

I was told slit fire plugs add horse power. Anybody know if this is true?

**COBALT** · 09-03-2002, 12:05 PM

I use either Autolite #26 or Champion #25 in my 350.

68 with 350 TPI · 09-03-2002, 12:42 PM

stick with AC Delco, champion,autolite.

Never cared for fancy plugs like split fire.
If you want more go from your plugs get a MSD 6AL box

Bamm · 09-03-2002, 02:09 PM

Q: Do those fancy split tip sparkplugs really work?
A: No. Electricity follows the path of least resistance. It has nothing to do with a split tip or a fancy U groove! The sparkplug does one thing only. It acts as the grounding source for the ignition and that's it, period, end of story. The only difference with a sparkplug is that there is a gap in the current path. The size of the spark is dictated by the voltage and amperage output of your coil and the output of your coil is dictated by the saturation (dwell) time of your ignition system. You'll hear claims like, "it made more horsepower" or "I got better gas mileage". Well of course they did! Their engine needed a tune-up or they wouldn't have tried the new plugs in the first place! Any engine would get better gas mileage and more horsepower after a tune-up!

What split tipped plugs can do is promote pre-ignition and/or detonation. How? Try this, take a hanger and try to heat it up with a cigarette lighter. Oh yeah, it gets hot, but not hot enough to glow cherry red. Now take a paper clip and heat it up with the same lighter. It gets hotter faster and glows cherry red! It's simple, it takes less heat to heat-up smaller objects. What do you think those tiny little pieces of split tip electrodes are doing in your engine? Now add more compression and heat (a race engine) and they act like a dog gone glow plug... detonation... ka-boom! Just about in that order.

Not my quote. I got this info from http://www.badasscars.com/techtips.html
great site with lots of info...........JB

justin · 09-03-2002, 02:14 PM

So basically your telling me I wasted 5 bucs a pop on these slit fires.
Bummer

Bamm · 09-03-2002, 02:35 PM

Dude, I have them in my saturn, and they are not bad plugs, that's not what the guy is saying. Just don't expect too much out of a plug. Try them you might like them, but you would have probably been just as well off if you had used the rapid fires..........JB

**COBALT** · 09-03-2002, 02:49 PM

Dude! Yeah, no, seriously, dude.....

lol just picking on ya Bamm 24

Bamm · 09-03-2002, 03:27 PM

Dude, like I have them in my, hey wait a minute "Hey Dude, Where's my car?"
o.k. bad joke, even worse movie.......LOL...........JB
But check out the website, it is top notch.................JB

09-02-2002, 03:25 PM	#1
MandarinSixSeven Seasonal Poster Join Date: Apr 2002 Location: Kelowna BC Canada Posts: 896	What Spark Plugs to Use? I'm just about to go out and buy some new Plugs, i was told that since Ac Delco are what would have come on these trucks, then they are the ones that would most likely be the best, since GM vehicles are made to use AC Delco...what are your thoughts on this? ...i mean it makes sense to me, but, are there any reasons to not believe this? __________________ 67 GMC Short Step 350/4-Speed/3.08 Posi Front/Rear Sway Bars Kelowna BC, Canada Member of DTPW

09-03-2002, 09:56 AM	#3
Jmac05 L.E.D. Tail lights, Baby! Join Date: Jan 2002 Location: Corona, Ca Posts: 290	Make *SURE* The ones you get are the right ones. I was getting all new plugs and wires, and the friggin' idiot at the Autozone gave me plugs way too long, and I almost cracked a piston! Double check the new ones against the old ones. __________________ *Prov 3:5-8* "Hook 'em" L.E.D. Taillights for sale NOW!!! If interested, visit: www.earlyclassic.com or our website: www.jmcled.com All 67-72 GM Taillights are on sale untill 5 p.m. on Dec 15th, with Guaranteed Christmas delivery! joel.mcwaters@jmcled.com

09-03-2002, 10:43 AM	#4
justin PROJECT LO-LYF Join Date: Jul 2002 Location: MO. Posts: 285	I was told slit fire plugs add horse power. Anybody know if this is true? __________________ FOUNDING MEMBER OF THE "O-SH*T, THAT TRUCK IS LOW" CLUB PROJECT: LO-LYF Bagged 68 Shorty home.att.net/~justin.lewis

09-03-2002, 12:05 PM	#5
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	I use either Autolite #26 or Champion #25 in my 350. __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

09-03-2002, 12:42 PM	#6
68 with 350 TPI Registered User Join Date: May 2002 Location: Wingate NC Posts: 456	stick with AC Delco, champion,autolite. Never cared for fancy plugs like split fire. If you want more go from your plugs get a MSD 6AL box __________________ Life is good with a 6-71 supercharged 355 in a 72 camaro

09-02-2002, 04:17 PM	#2
Mountain Man Registered User Join Date: Jan 2002 Location: Calgary, Alberta, Canada Posts: 451	You can use what ever brand you like. There are lots of good plugs out there, Bosch, Champion, etc. I have tried them all, and the ones that actually did feel a bit more responsive, and the ones I run, are the AC Rapid Fires. I use .045 gap for my 355 __________________ 72 C10 Cheyenne Super Full trim Factory tach dash A/C dash Factory tilt 350 / 350 power train - with Edelbrock components.

09-03-2002, 02:09 PM	#7
Bamm Cowboy Fan for Life!!!!!! Join Date: Apr 2002 Location: Amelia, Virginia Posts: 2,921	Q: Do those fancy split tip sparkplugs really work? A: No. Electricity follows the path of least resistance. It has nothing to do with a split tip or a fancy U groove! The sparkplug does one thing only. It acts as the grounding source for the ignition and that's it, period, end of story. The only difference with a sparkplug is that there is a gap in the current path. The size of the spark is dictated by the voltage and amperage output of your coil and the output of your coil is dictated by the saturation (dwell) time of your ignition system. You'll hear claims like, "it made more horsepower" or "I got better gas mileage". Well of course they did! Their engine needed a tune-up or they wouldn't have tried the new plugs in the first place! Any engine would get better gas mileage and more horsepower after a tune-up! What split tipped plugs can do is promote pre-ignition and/or detonation. How? Try this, take a hanger and try to heat it up with a cigarette lighter. Oh yeah, it gets hot, but not hot enough to glow cherry red. Now take a paper clip and heat it up with the same lighter. It gets hotter faster and glows cherry red! It's simple, it takes less heat to heat-up smaller objects. What do you think those tiny little pieces of split tip electrodes are doing in your engine? Now add more compression and heat (a race engine) and they act like a dog gone glow plug... detonation... ka-boom! Just about in that order. Not my quote. I got this info from http://www.badasscars.com/techtips.html great site with lots of info...........JB __________________ 1967 ShortBed Fleetside 3/4 Drop 350/700R4 Tilt wheel 18 x 8 Torque Thrust II's Future mods: All new gauges & wood bed My Zip is 23002 I ship UPS, USPS

09-03-2002, 02:14 PM	#8
justin PROJECT LO-LYF Join Date: Jul 2002 Location: MO. Posts: 285	So basically your telling me I wasted 5 bucs a pop on these slit fires. Bummer __________________ FOUNDING MEMBER OF THE "O-SH*T, THAT TRUCK IS LOW" CLUB PROJECT: LO-LYF Bagged 68 Shorty home.att.net/~justin.lewis

09-03-2002, 02:35 PM	#9
Bamm Cowboy Fan for Life!!!!!! Join Date: Apr 2002 Location: Amelia, Virginia Posts: 2,921	Dude, I have them in my saturn, and they are not bad plugs, that's not what the guy is saying. Just don't expect too much out of a plug. Try them you might like them, but you would have probably been just as well off if you had used the rapid fires..........JB __________________ 1967 ShortBed Fleetside 3/4 Drop 350/700R4 Tilt wheel 18 x 8 Torque Thrust II's Future mods: All new gauges & wood bed My Zip is 23002 I ship UPS, USPS

09-03-2002, 02:49 PM	#10
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	Dude! Yeah, no, seriously, dude..... lol just picking on ya Bamm 24 __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

09-03-2002, 03:27 PM	#11
Bamm Cowboy Fan for Life!!!!!! Join Date: Apr 2002 Location: Amelia, Virginia Posts: 2,921	Dude, like I have them in my, hey wait a minute "Hey Dude, Where's my car?" o.k. bad joke, even worse movie.......LOL...........JB But check out the website, it is top notch.................JB __________________ 1967 ShortBed Fleetside 3/4 Drop 350/700R4 Tilt wheel 18 x 8 Torque Thrust II's Future mods: All new gauges & wood bed My Zip is 23002 I ship UPS, USPS



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