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  1. #1
    Sr. Mechanic Ethan's Avatar
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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
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    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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    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?

  4. #4

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    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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    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.

  6. #6
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    murdog94's Avatar
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    Default

    AC delco iridiums.

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