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  1. #1
    Sr. Mechanic Ethan's Avatar
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    Sep 2009
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    Cedar Park, TX
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    Default NGK Spark plugs for 350?

    I'm looking at the NGK Iridium spark plugs on the internet, and they say they make them for 350's. My question is are these better than the AC Delco Platinum and will they help me pass emissions better since I'm kinda on the edge right now?

    These kind specifically: http://www.oreillyauto.com/site/c/de...3435&ppt=C0334
    1994 Chevy Silverado 1500 Ext Cab 350 cuin TBI in dark Chevy blue
    160,000+ miles
    Original paint
    Original interior
    Original engine and tranny
    wrecked twice stolen once
    Diamond Plate bed rails
    Power windows
    Original Alloy wheels
    Original fancy smancy cup holder
    Tow package
    Original plastic bed liner
    K&N Cone Air Intake
    Dual MagnaFlow exhaust(not true dual) with chrome tips
    MSD Street Fire Performance Ignition coil

  2. #2
    Legend
    murdog94's Avatar
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    Default

    Nope even the TBI motors prefer AC plugs. but since you are right on the edge when was the last time the motor had a full tune up?
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  3. #3
    Sr. Mechanic Ethan's Avatar
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    Sep 2009
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    Cedar Park, TX
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    Default

    Not too long ago, put on a new cap and rotor about 9 months ago, new MSD ignition coil about 6 months ago. Spark plugs and plug wires were about a year and a half ago. I know the catylic is 17 years old, but I put it on a gas analyzer and it passes, but just barely. I gaped the plugs to .060 instead of .035 and it made an improvement emission wise.

    I've always liked NGK plugs, I use them in all my small motors and they are just awesome, extremely hard to foul, so I figured the Iridium's for my chevy would be even better.

    What would you recommend?
    1994 Chevy Silverado 1500 Ext Cab 350 cuin TBI in dark Chevy blue
    160,000+ miles
    Original paint
    Original interior
    Original engine and tranny
    wrecked twice stolen once
    Diamond Plate bed rails
    Power windows
    Original Alloy wheels
    Original fancy smancy cup holder
    Tow package
    Original plastic bed liner
    K&N Cone Air Intake
    Dual MagnaFlow exhaust(not true dual) with chrome tips
    MSD Street Fire Performance Ignition coil

  4. #4

    Default

    AC Delco CR43TS, gapped at .035.
    When you hear hoofbeats, look for horses not zebras.

  5. #5
    Sr. Mechanic Ethan's Avatar
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    Sep 2009
    Location
    Cedar Park, TX
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    150

    Default

    Can't use copper top plugs with this ignition setup, tried it, and melted the electrodes and caused massive missfires. Even the manual recommends at minimum platinum plugs for this truck.
    1994 Chevy Silverado 1500 Ext Cab 350 cuin TBI in dark Chevy blue
    160,000+ miles
    Original paint
    Original interior
    Original engine and tranny
    wrecked twice stolen once
    Diamond Plate bed rails
    Power windows
    Original Alloy wheels
    Original fancy smancy cup holder
    Tow package
    Original plastic bed liner
    K&N Cone Air Intake
    Dual MagnaFlow exhaust(not true dual) with chrome tips
    MSD Street Fire Performance Ignition coil

  6. #6
    Legend
    murdog94's Avatar
    Join Date
    Feb 2008
    Location
    Cloquet, Minnesota, United States
    Posts
    8,198
    Blog Entries
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    Default

    AC delco iridiums.
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  7. #7

    Default

    X2, A/C Delco irridiums.
    :cool:

    2005 Chevy Silverado Z71 Crew Cab
    6" Skyjacker lift w/Edlebrock dual front remote resoviour shocks, single rear remote. Rancho skid-plate.
    17" x 9" M/T Classic Lock Wheels, 35" BFG A/T or M/T tires
    4.10 PercisionGears w/factory locker, T/A Performance rear-end cover
    Banks CAI intake, ported throttlebody, JBA coated headers, over-sized Magnaflow cats, Magnaflow cat back exhaust, Diablo tuned
    B&M aluminum deep transmission pan
    Warn brush guard w/Warn 9.5 XP winch, PIAA bulbs, Line-X bedliner, AWS Black tool chest, Extang tonneau cover
    Weather Tech floor mats
    Cover-Craft seat covers
    Dash mat cover
    Formula One window tint
    One black Lab in rear seat.
    :glasses:

  8. #8

    Default

    Quote Originally Posted by Ethan View Post
    Can't use copper top plugs with this ignition setup, tried it, and melted the electrodes and caused massive missfires. Even the manual recommends at minimum platinum plugs for this truck.
    Any pics of these melted electrodes?
    When you hear hoofbeats, look for horses not zebras.

  9. #9
    Sr. Mechanic Ethan's Avatar
    Join Date
    Sep 2009
    Location
    Cedar Park, TX
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    Default

    Quote Originally Posted by 2COR517 View Post
    Any pics of these melted electrodes?
    Nah, it was a few years ago. I conducted a cylinder balance test, and it easily showed each cylinder was kinda out of wack, put in the AC Delco Platinum's and they were all balanced.

    My truck uses a high voltage ignition system, which is why it melted the copper top plugs, copper top plugs are cold plugs, and I needed hot plugs, which platinum's are.

    So I'm looken for these plugs? http://www.summitracing.com/parts/ACF-41-110/
    Last edited by Ethan; 12-02-2011 at 12:01 PM.
    1994 Chevy Silverado 1500 Ext Cab 350 cuin TBI in dark Chevy blue
    160,000+ miles
    Original paint
    Original interior
    Original engine and tranny
    wrecked twice stolen once
    Diamond Plate bed rails
    Power windows
    Original Alloy wheels
    Original fancy smancy cup holder
    Tow package
    Original plastic bed liner
    K&N Cone Air Intake
    Dual MagnaFlow exhaust(not true dual) with chrome tips
    MSD Street Fire Performance Ignition coil

  10. #10

    Default

    Below is from A/C Delco's Online Part Catalog......its a Platinum Plug.......for a 1994" With a 350,

    SPARK PLUG ASM
    Part Number: 41-803
    Product Notes:
    Platinum Spark Plug
    Reg cab ; 2WD ; .035 GAP

    Per Vehicle: 8; Years: 1989-1994



    MIKE


    99"SILVERADO
    5.3 l 3.73 l G80
    BLACK BEAR CUSTOM TUNE
    SNUGTOP l COLORMATCH l KATZKIN










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