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TBI 350 Spark Plug Gap?

This is a discussion on TBI 350 Spark Plug Gap? within the Technical / Maintenance forums, part of the General Discussion category; I have a set of AC Delco Platinum #1's to replace the cheap NGK's I currently have in my truck, ...

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    Registered User ChrisAU's Avatar
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    TBI 350 Spark Plug Gap?


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    I have a set of AC Delco Platinum #1's to replace the cheap NGK's I currently have in my truck, they come gapped at .045, should I re-gap to .035?
    1992 ECSB 5.7L Z-71

    Past GM's:
    1998 ECSB 5.7L Z-71
    2007 Tahoe LT2 5.3L
    1999 ECSB 5.3L Z-71
    1992 RCSB 5.7L Z-71
    1993 RCSB 5.7L Z-71

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    Home of the Snooki punch! CKTA's Avatar
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    Re: TBI 350 Spark Plug Gap?

    Yup.
    2014 Carlisle All Truck Nats info..
    http://www.fullsizechevy.com/forum/o...g-1st-3rd.html


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    Resident Dick Quyonmob's Avatar
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    Re: TBI 350 Spark Plug Gap?

    0.045 will run fine in a TBI with quality ignition components, IMO.

    When I ran my 6AL box in the 92, I had opened coppers all the way to 0.060 with absolutely no ill effects. After the 6AL box was removed I ran 0.044 on stock replacement ignition parts with no issue.

    Plug gap can be touchy subject as to it's benefits and drawbacks.

    Did you ever get your truck sorted out?
    Last edited by Quyonmob; 07-19-2012 at 08:42 AM.

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    Registered User ChrisAU's Avatar
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    Re: TBI 350 Spark Plug Gap?

    Yeah, there was a short in the distributor and somewhere along the way I believe the first shop had pulled the plugs to inspect them and bumped a couple when putting them back in and closed the gaps, making the terrible miss when it got warm after I picked it up from the 2nd shop the 1st time. 2nd shop discovered that and re-gapped them, and then recommended I go back to AC Delco plugs. I've ordered some Rapidfire Platinum #1's.

    It still has a slight shake at warm idle, not really a rumble and certainly not a miss, but I really want it to be close to perfect because EVERYTHING is new. Also putting in a new AC Delco 195* thermostat because I believe I threw in a 160* or 180* when I got the truck (the one it had was stuck open), and the temp gauge never touches 200*, stays around 160-180 (hard to approximate), and the temp sender and pigtail in the block is new (that didn't work at all when I got the truck), so I'm wondering if the ECM is overfueling me a little bit once warm because its trying to warm it up but the low-temp t-stat isn't allowing the coolant to get hot.
    1992 ECSB 5.7L Z-71

    Past GM's:
    1998 ECSB 5.7L Z-71
    2007 Tahoe LT2 5.3L
    1999 ECSB 5.3L Z-71
    1992 RCSB 5.7L Z-71
    1993 RCSB 5.7L Z-71

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    Resident Dick Quyonmob's Avatar
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    Re: TBI 350 Spark Plug Gap?

    IMO, cancel the order for the platinums and get some OE CR43TS plugs.

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    Registered User ChrisAU's Avatar
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    Re: TBI 350 Spark Plug Gap?

    Meh I had a bad experience with them, got some that were crap, haven't liked them since.
    1992 ECSB 5.7L Z-71

    Past GM's:
    1998 ECSB 5.7L Z-71
    2007 Tahoe LT2 5.3L
    1999 ECSB 5.3L Z-71
    1992 RCSB 5.7L Z-71
    1993 RCSB 5.7L Z-71

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    Resident Dick Quyonmob's Avatar
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    Re: TBI 350 Spark Plug Gap?

    Quote Originally Posted by ChrisAU View Post
    Meh I had a bad experience with them, got some that were crap, haven't liked them since.
    Bad experience with AC Delco Coppers? Why continue with Delco's at all then, as the platinums are the same plug, but with platinum coating on the contacts.

    FYI Platinum plugs should be gapped very carefully or the platinum will be damaged.

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    Registered User ChrisAU's Avatar
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    Re: TBI 350 Spark Plug Gap?

    Would you consider all new AC Delco ignition components as quality? Wires, cap, rotor, coil, distributor, ICM, pick-up coil.
    1992 ECSB 5.7L Z-71

    Past GM's:
    1998 ECSB 5.7L Z-71
    2007 Tahoe LT2 5.3L
    1999 ECSB 5.3L Z-71
    1992 RCSB 5.7L Z-71
    1993 RCSB 5.7L Z-71

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    Resident Dick Quyonmob's Avatar
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    Re: TBI 350 Spark Plug Gap?

    Quote Originally Posted by ChrisAU View Post
    Would you consider all new AC Delco ignition components as quality? Wires, cap, rotor, coil, distributor, ICM, pick-up coil.
    Absolutely. OE quality and all brand new.

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    Registered User ChrisAU's Avatar
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    Re: TBI 350 Spark Plug Gap?

    Ok...I may just check that they are all indeed .045 and throw them in and evaluate from there.
    1992 ECSB 5.7L Z-71

    Past GM's:
    1998 ECSB 5.7L Z-71
    2007 Tahoe LT2 5.3L
    1999 ECSB 5.3L Z-71
    1992 RCSB 5.7L Z-71
    1993 RCSB 5.7L Z-71

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    Re: TBI 350 Spark Plug Gap?

    No dont throw them in carefully use antiseze and torque the plugs and make sure the wires are seated to the plugs and cap.



    Quote Originally Posted by ChrisAU View Post
    Ok...I may just check that they are all indeed .045 and throw them in and evaluate from there.
    04 K1500 Silverado EXT 3:73 gears, 5.3L 265/75-16,Pace Edwards tonneau,

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    Registered User ChrisAU's Avatar
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    Re: TBI 350 Spark Plug Gap?

    Quote Originally Posted by redvett01 View Post
    No dont throw them in carefully use antiseze and torque the plugs and make sure the wires are seated to the plugs and cap.
    Well that is what I meant haha
    1992 ECSB 5.7L Z-71

    Past GM's:
    1998 ECSB 5.7L Z-71
    2007 Tahoe LT2 5.3L
    1999 ECSB 5.3L Z-71
    1992 RCSB 5.7L Z-71
    1993 RCSB 5.7L Z-71

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    Resident Dick Quyonmob's Avatar
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    Re: TBI 350 Spark Plug Gap?

    Quote Originally Posted by ChrisAU View Post
    Well that is what I meant haha
    IMO, throw them in from 20ft to improve your accuracy, might take a few tries, but you'll get it.

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    Registered User ChrisAU's Avatar
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    Re: TBI 350 Spark Plug Gap?

    Quote Originally Posted by Quyonmob View Post
    IMO, throw them in from 20ft to improve your accuracy, might take a few tries, but you'll get it.
    I was gonna shoot 'em in with a mini potato gun.
    1992 ECSB 5.7L Z-71

    Past GM's:
    1998 ECSB 5.7L Z-71
    2007 Tahoe LT2 5.3L
    1999 ECSB 5.3L Z-71
    1992 RCSB 5.7L Z-71
    1993 RCSB 5.7L Z-71

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    Resident Dick Quyonmob's Avatar
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    Re: TBI 350 Spark Plug Gap?

    Quote Originally Posted by ChrisAU View Post
    I was gonna shoot 'em in with a mini potato gun.
    File the the 5/8ths nut part off and I bet they fit in a 12gau shell on top of the wad. Use a rifled barrel and they might spin right in to torque.
    Last edited by Quyonmob; 07-20-2012 at 07:52 AM.

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    Registered User ChrisAU's Avatar
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    Re: TBI 350 Spark Plug Gap?

    Quote Originally Posted by Quyonmob View Post
    File the the 5/8ths nut part off and I bet they fit in a 12gau shell on top of the wad. Use a rifled barrel and they might spin right in to torque.
    Genius. This is why I come here, superior knowledge. Thanks!
    1992 ECSB 5.7L Z-71

    Past GM's:
    1998 ECSB 5.7L Z-71
    2007 Tahoe LT2 5.3L
    1999 ECSB 5.3L Z-71
    1992 RCSB 5.7L Z-71
    1993 RCSB 5.7L Z-71

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    Resident Dick Quyonmob's Avatar
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    Re: TBI 350 Spark Plug Gap?

    Quote Originally Posted by ChrisAU View Post
    Genius. This is why I come here, superior knowledge. Thanks!
    May want to drop a towel over your fenders for protection.

  18. #18
    Registered User ChrisAU's Avatar
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    Re: TBI 350 Spark Plug Gap?

    The truck already has a good bit of character...a spark plug halfway embedded in the fender would make for some interesting stories. "How'd that happen Chris?" "Well, you see..."
    1992 ECSB 5.7L Z-71

    Past GM's:
    1998 ECSB 5.7L Z-71
    2007 Tahoe LT2 5.3L
    1999 ECSB 5.3L Z-71
    1992 RCSB 5.7L Z-71
    1993 RCSB 5.7L Z-71

  19. #19
    Resident Dick Quyonmob's Avatar
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    Re: TBI 350 Spark Plug Gap?

    Quote Originally Posted by ChrisAU View Post
    The truck already has a good bit of character...a spark plug halfway embedded in the fender would make for some interesting stories. "How'd that happen Chris?" "Well, you see..."

  20. #20
    Registered User ChrisAU's Avatar
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    Re: TBI 350 Spark Plug Gap?

    Alright, after I get my truck back this Friday from the transmission rebuild, I think we are going to have some bonding time Saturday in the form of a 195* t-stat, new oil pressure sending unit, transmission cooler, and these new AC Delco platinums I have.

    Just to be sure, I should be ok with the .045 gap, right?
    1992 ECSB 5.7L Z-71

    Past GM's:
    1998 ECSB 5.7L Z-71
    2007 Tahoe LT2 5.3L
    1999 ECSB 5.3L Z-71
    1992 RCSB 5.7L Z-71
    1993 RCSB 5.7L Z-71

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