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NGK Spark plugs for 350?

Discussion in 'Performance & Fuel' started by Ethan, Nov 30, 2011.

  1. Ethan

    Ethan New Member

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    #1
  2. murdog94

    murdog94 New Member

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    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?
    #2
  3. Ethan

    Ethan New Member

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    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?
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  4. 2COR517

    2COR517 New Member

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    AC Delco CR43TS, gapped at .035.
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  5. Ethan

    Ethan New Member

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    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.
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  6. murdog94

    murdog94 New Member

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    AC delco iridiums.
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  7. silveradotrailblazer

    silveradotrailblazer New Member

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    X2, A/C Delco irridiums.:great:
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  8. 2COR517

    2COR517 New Member

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    Any pics of these melted electrodes?
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  9. Ethan

    Ethan New Member

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    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: Dec 2, 2011
    #9
  10. 99'HEARTBEAT

    99'HEARTBEAT Moderator

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

    [TABLE]
    [TR]
    [TD="align: center"][​IMG][/TD]
    [TD="width: 30, align: center"] [/TD]
    [TD]SPARK PLUG ASM
    Part Number: 41-803
    Product Notes:
    Platinum Spark Plug
    Reg cab ; 2WD ; .035 GAP

    Per Vehicle: 8; Years: 1989-1994[/TD]
    [/TR]
    [/TABLE]


    #10
  11. Ethan

    Ethan New Member

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    I already have platinum plugs in there, I'm looking for a little bit better burn since I have a higher output ignition coil on there now.
    #11

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