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spark plugs (4/14)
 7/30/11 11:14pm
Gunslinger
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Frederick, MD - USA

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1969 convertible L71 427/435 4-speed black interior


Joined: 9/8/2003
Posts: 3398

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Joel is absolutely correct.  In a stock system installing exotic spark plugs only serves to enhance the spark plug maker's (and ad agency's) bank account at the expense of your wallet...but you do get a nice little decal in the box so you can place it in a conspicuous spot on your car so everyone knows what spark plugs you use.  It's kinda reverse endorsement arrangement...instead of them paying you to endorse their product, you're paying them to endorse their product!  Just joking...stock plugs are all you need.

The most important thing in selecting a spark plus is proper heat range.  Unless you're trying to address a specific issue, the manufacturer's recommendation is all you need.  Pick your brand.  I have AC's in my '69 but I know many swear by NGK.  Your money...your choice.
spark plugs (5/14)
 7/30/11 11:15pm
KDADDY79
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Dutchess County, NY - USA

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Approve A second plug for the stock AC/Delco's here.
I think the technology of a carburated 350 calls for the stock plugs.
I wouldn't want to find out what the wrong plugs could do to my motor.
Tell us what you decide to go with.
Kevin
spark plugs (6/14)
 7/31/11 12:04am
legsdiamond
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St. Louis, MO - USA

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1976 Corvette


Joined: 2/5/2010
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Thanks guys...I think I will go with the AC Delcos!
spark plugs (7/14)
 7/31/11 8:13pm
Ron 78Lifetime Member
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BINGHAMTON, NY - USA

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A.C.Delco's in all my vehicles

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spark plugs (8/14)
 8/1/11 8:15am
manchestersharkLifetime Member
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Equinunk, PA - USA

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1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.


Joined: 10/31/2007
Posts: 2011

Big smile They're good enuf for the General, they're good enuf for me.
spark plugs (9/14)
 8/1/11 10:34pm
anips
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sonoma, CA - USA

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72 LT-1 AC coupe,69 l-36 coupe


Joined: 8/9/2002
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if you have more time than money, you can index your stock plugs and file the ground back so that the end stops over the center of the electrode, there are different thories but I index the plug so the open end of the electrode- ground face the top of the piston and filing back the ground helps unshroud the spark, or if you don't have the time for a little more money you can try GM's Rapid Fire plugs they work and they are way cheaper than Iridium and Split Fire is junk. anips2011-08-01 19:39:44
spark plugs (10/14)
 8/2/11 5:59pm
legsdiamond
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St. Louis, MO - USA

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1976 Corvette


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Hey Anips,
 
Where would be the best place to purchase GM's Rapid Fire plugs? They will work in a 350? Right?
 
Thanks,
 
Darrell
spark plugs (11/14)
 8/2/11 7:07pm
anips
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sonoma, CA - USA

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72 LT-1 AC coupe,69 l-36 coupe


Joined: 8/9/2002
Posts: 784

yea, they will work in a small block, they are available at the chevy dealer and most auto parts store, just make sure you get the right heat range and type for your application, they will most likely be cheaper at auto parts, GM won"t give ya a break.

spark plugs (12/14)
 8/2/11 10:31pm
Jaws79Lifetime Member
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Sykesville, MD - USA

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1979 Corvette Coupe Corvette Light Blue Midnight Blue interior Mirrored Glass T-tops


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The General wouldn't do you wrong, would he?
 
Barry
 
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spark plugs (13/14)
 8/3/11 9:08pm
daveo76
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Vancouver, WA - USA

Vette(s):
1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.


Joined: 8/25/2005
Posts: 838

I used Delco R45TS when my motor was stock.  Now that I'm doing some significant upgrades I'm wondering what plug to use.  My engine builder suggested Autolite 26, but I like the Delcos.  Any thoughts on what to use with the Vortec heads, 9.4:1 CR, mild cam?  

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1976 Silver/Firethorn.  L48, 4spd.  Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.
Re: spark plugs (14/14)
 9/22/19 8:45am
cinorLifetime Member
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, - Canada

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1975 L48 Stingray 1992 LT1


Joined: 12/24/2013
Posts: 408

Wow, who knew that choosing spark plugs could be so difficult.  The 75-76 used a 41-100 with a .060 gap and I read in a forum that they figured this was more to do with the new emissions brought in in 1975 , then I seen a post that said the updated oem was with ac delco 41-110 and .40 gap.  So I decided to go with latter , what do you think, am I safe with these and my new build



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