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Spark plug reach and gap... 97 5.7 liter vortec k1500

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  • Spark plug reach and gap... 97 5.7 liter vortec k1500

    I have been researching and googling this tirelessly the last few hours, as far as i can tell my spark plug gap is .060, but to make things more confusing for me, i read some stuff that a service bulletin recommended gapping to .040" instead of the oem recommended. Is this true for my year of vortec?
    Also curious what i should be looking at as far as spark plug reach. When i search spark plugs on summit racing it comes up with several different options that fit my truck, some with a reach of .708" and some with .691" and .690". Are these so close that it wont matter?
    97 Z-71 x-cab 5.7 liter,
    6" Rancho, 3" PA BL
    315-75-16 BFG MT's 16x10 Pro Comp alloys,
    Flowmaster single in, dual out,
    Gibson Shorty headers,
    Airaid CAI, airaid TBS,
    Jet mass air flow sensor
    Nelson Tune, Precision 4.56's with Truetrac,
    And a mossy oak steering wheel cover!

  • #2
    Re: Spark plug reach and gap... 97 5.7 liter vortec k1500

    The reaches are so close that it doesn't matter.

    I believe .040 is the spark plug gap you should be using.
    DD -07 Illverado, 5.3, Airaid, 4/6 mcgaughys deluxe drop, HID projectors, LED in/out, colormatched ext/int, chrome U2 55 24x10, 15% over factory, rollpan, RST spoiler, lots of mods

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    • #3
      I was about to change them on my 96 tomorrow, I was going with 060 but if it should be 040 I would like to know.

      -Jesse, '96 C1500 5.7L
      -Jesse
      1996 C1500 - 5.7L - 2WD - 4.56 14-bolt G80 - Tuned
      Whipple Supercharger, Headers, custom mandrel bent exhaust, Flowmaster 44s
      Race built stage 4 4L60E
      3" BL, 4" Spindle Lift, 43" at the fenders, 32" tires

      Comment


      • #4
        Re: Spark plug reach and gap... 97 5.7 liter vortec k1500

        Stay with the 0.060", thats what the factory spec is. The coil used on the vortec is significantly hotter than teh TBI trucks. Its teh same coil as used on the LT1/4 LT1's.
        The reachon the Vortec and non Vortec ehad is different and is known to cause issues if mixed. But the specs you supply are pretty close and shoudlnt matter I would think.

        peace
        PAuly
        97 GMC 2wd RCSB 5.7, s10 2700 footstall, Hooker 24621hkr LT's , 2.5" cats dual 4"pipes exit B4 pass. side tire, custom driveshaft 3.42 G80 FIPK MAF descreen GM/Mercruiser Marine intake manifold 29lb LS2(EV6) injectors Ed Wright PCM(best mod), LT4 KM 14.8@94mph 2.007 4000lbs 122mph

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        • #5
          Re: Spark plug reach and gap... 97 5.7 liter vortec k1500

          Does the .040" bulletin not apply to my year of vortec? Another instance where one guy says 060, another says 040. Is anyone running .040"in their obs 5.7 liter?
          97 Z-71 x-cab 5.7 liter,
          6" Rancho, 3" PA BL
          315-75-16 BFG MT's 16x10 Pro Comp alloys,
          Flowmaster single in, dual out,
          Gibson Shorty headers,
          Airaid CAI, airaid TBS,
          Jet mass air flow sensor
          Nelson Tune, Precision 4.56's with Truetrac,
          And a mossy oak steering wheel cover!

          Comment


          • #6
            Re: Spark plug reach and gap... 97 5.7 liter vortec k1500

            here is the TBS on the plug gap change..

            Subject: Information on New Spark Plugs and Gapping #03-06-04-060 - (10/24/2003)



            Models: 2004 Buick Ranier

            2002-2004 Cadillac Escalade, Escalade EXT

            2003-2004 Cadillac Escalade ESV

            2004 Cadillac CTS-V

            1997-2004 Chevrolet Corvette

            1998-2002 Chevrolet Camaro

            1999-2004 Chevrolet Silverado

            2000-2004 Chevrolet Suburban, Tahoe

            2002-2004 Chevrolet Avalanche

            2003-2004 Chevrolet Express, TrailBlazer

            1999-2004 GMC Sierra

            2000-2004 GMC Yukon, Yukon XL

            2001-2004 GMC Yukon Denali, Yukon XL Denali

            2002-2004 GMC Sierra Denali

            2003-2004 GMC Envoy XL

            1998-2002 Pontiac Firebird

            2004 Pontiac GTO

            2003-2004 Hummer H2

            with 4.8L, 5.3L, 5.7L or 6.0L V-8 Engine (VINs V, P, T, Z, G, S, N, U -- RPOs LR4, LM4, LM7, L59, LS1, LS6, LQ9, LQ4)




            --------------------------------------------------------------------------------

            A new spark plug has been released for use in the above vehicles. The new spark plug has an Iridium tip instead of the current Platinum tip. Due to the different tip design, the gap of the spark plug has also changed. The new spark plug, P/N 12571164 with AC Delco P/N 41-985, is gapped to 1.01mm (0.040 inches) when the spark plug is made. The spark plug gap is set during manufacturing and should not be changed or damage to the spark plug may result. Any new spark plug found to not be properly gapped should not be used.

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