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Spark Plug Reference Chart

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  1. #1
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    Spark Plug Reference Chart

    Hey guys, been working on this for a little while and finally have it ready to post. Maybe someone can sticky it to the top so that people can easily reference it? It's fairly hard to compare each manufacturers heat range since there are so many factors involved but this is, in my opinion, the closest match for NGK's heat range system, which was used in the chart. If you guys would like to see certain plug manufacturers added, let me know.



    Spark Plug Info

    **Note: Heat ranges are determined by NGK standards. Not all plug manufacturers follow the same guidelines.

    ***Note: List is intended for reference only. Please consult with head mfg. and ignition mfg. for proper gap.

    ****Note: NGK IX and Denso plugs are Iridium.


    LT1
    Thread 14mm
    Reach - .708
    Socket 5/8 hex
    Seat - Taper
    Stock Heat Range: 5
    Gap: .050
    Plug: NGK TR55 (stock number 3951); NGK TR55IX (stock number 7164); Autolite 764; Champion RS14YC6 (stock number 13); Denso IT-16 (stock number 5325)


    Nitrous (one step colder)
    Heat range: 6
    Gap: .035 - .038
    Plug: NGK TR6 (stock number 4177); NGK TR6IX (stock number 3689); Autolite 103; Denso IT-20 (stock number 5326)


    Nitrous (two steps colder)
    Heat Range: 7
    Gap: Consult
    Plug: NGK BR7EF (stock number 3346); NGK TR7IX (stock number 3690); Autolite AR94; Denso IT22 (stock number 5327)



    LT1 w/ AFR heads
    Thread 14mm
    Reach 3/4
    Socket 5/8 hex
    Seat Gasket
    Stock MFG Recommendations
    Heat Range: 9
    Gap: Consult ignition mfg.
    Plug: NGK 5672A-9 (stock number 7405); Autolite AR3910; Champion C59YC (stock number 792); Denso IQ27 (stock number 5315); Denso IQ01-27 (stock number 5708)(diagonal platinum ground); Denso IQ02-27 (stock number 5711)(horizontal platinum ground)


    Nitrous (one step colder)
    Heat Range: 10
    Gap: Consult ignition mfg.
    Plug: NGK 5672A-10 (stock number 7942); Autolite AR50; Denso IQ31 (stock number 5323)


    Nitrous (two steps colder)
    Heat Range: 11
    Gap: Consult ignition mfg.
    Plug: Denso IQ34 (stock number 5324)



    LT1 w/ Trick Flow & Edelbrock Heads
    Thread 14mm
    Reach 3/4
    Socket 5/8 hex
    Seat Gasket


    Stock MFG Recommendations: approx under 9:1 compression
    Heat Range: 4
    Gap: Consult ignition mfg.
    Plug: NGK FR4 (stock number 5155); NGK BKR5EIX (stock number 6341); Autolite 3926; Champion RC12YC (stock number 71); Denso IK16 (stock number 5303)

    MFG Recommendations: approx 10.5:1 compression
    Heat Range: 5
    Gap: Consult ignition mfg.
    Plug: NGK FR5 (stock number 7373); Autolite AR3924 (Racing Plug); Autolite 3924; Champion RC9YC (stock number 2075); Denso K20PR-U (stock number 3145); Denso IK20 (stock number 5304)

    MFG Recommendations: approx 11:1 compression
    Heat Range: 8
    Gap: Consult ignition mfg.
    Plug: NGK R5672A-8 (stock number 7173); Autolite AR3911; Champion C63YC (stock number 796); Denso IQ24 (stock number 5314)

    MFG Recommendations: approx 12:1 compression
    Heat Range: 9
    Gap: Consult ignition mfg.
    Plug: NGK R5672A-9 (stock number 7405); Autolite AR3910; Champion C61YC (stock number 785); Denso IQ27 (stock number 5315)

    MFG Recommendations: approx 13:1 compression
    Heat Range: 9 - 10
    Gap: Consult ignition mfg.
    Plug: NGK R5671A-9 (stock number 5238); Autolite AR3933; Champion C59CX (stock number 296); Denso IK27 (stock number 5312)

    MFG Recommendations: approx 14:1 compression
    Heat Range: 10
    Gap: Consult ignition mfg.
    Plug: NGK R5671A-10 (stock number 5820); Autolite AR3932; Champion C57CX (stock number 295); Denso IK-31 (stock number 5321)


    **NOTE: Use chart for static compression and adjust heat range for nitrous use accordingly.



    LS1 Stock and AFR
    Thread 14mm
    Reach - .708
    Socket 5/8 hex
    Seat - Taper
    Stock Heat Range: 5
    Gap: .060
    Plug: NGK TR55 (stock number 3951); NGK TR55IX (stock number 7164); Autolite 764; Denso IT-16 (stock number 5325)


    Nitrous (one step colder)
    Heat Range: 6
    Gap: .035 - .038
    Plug: NGK TR6 (stock number 4177); NGK TR6IX (stock number 3689); Autolite 103; Denso IT-20 (stock number 5326)

    Nitrous (two steps colder)
    Heat Range: 7
    Gap: Consult
    Plug: NGK BR7EF (stock number 3346); NGK TR7IX (stock number 3690); Autolite AR94; Denso IT22 (stock number 5327)

    Nitrous (two and a half steps colder)
    Heat Range: 8
    Gap: Consult
    Plug: NGK R5724-8 (stock number 7317); NGK TR8IX (part number 3691); Denso IT-24 (stock number 5328)

    Nitrous (three steps colder)
    Heat Range: 9
    Gap: Consult
    Plug: NGK R5724-9 (stock number 7891); Autolite AR93; Denso IT-27

    Nitrous (four steps colder)
    Heat Range: 10
    Gap: Consult
    Plug: NGK R5724-10 (stock number 7993); Autolite AR92



    LS1 w/ Edelbrock and Dart Heads
    Thread 14mm
    Reach 3/4
    Socket 5/8 hex
    Seat Gasket

    Stock MFG Recommendations: approx under 9:1 compression
    Heat Range: 4
    Gap: Consult ignition mfg.
    Plug: NGK FR4 (stock number 5155); NGK BKR5EIX (stock number 6341); Autolite 3926; Champion RC12YC (stock number 71); Denso IK16 (stock number 5303)

    MFG Recommendations: approx 10.5:1 compression
    Heat Range: 5
    Gap: Consult ignition mfg.
    Plug: NGK FR5 (stock number 7373); Autolite AR3924 (Racing Plug); Autolite 3924; Champion RC9YC (stock number 2075); Denso K20PR-U (stock number 3145); Denso IK20 (stock number 5304)

    MFG Recommendations: approx 11:1 compression
    Heat Range: 8
    Gap: Consult ignition mfg.
    Plug: NGK R5672A-8 (stock number 7173); Autolite AR3911; Champion C63YC (stock number 796); Denso IQ24 (stock number 5314)

    MFG Recommendations: approx 12:1 compression
    Heat Range: 9
    Gap: Consult ignition mfg.
    Plug: NGK R5672A-9 (stock number 7405); Autolite AR3910; Champion C61YC (stock number 785); Denso IQ27 (stock number 5315)

    MFG Recommendations: approx 13:1 compression
    Heat Range: 9 - 10
    Gap: Consult ignition mfg.
    Plug: NGK R5671A-9 (stock number 5238); Autolite AR3933; Champion C59CX (stock number 296); Denso IK27 (stock number 5312)

    MFG Recommendations: approx 14:1 compression
    Heat Range: 10
    Gap: Consult ignition mfg.
    Plug: NGK R5671A-10 (stock number 5820); Autolite AR3932; Champion C57CX (stock number 295); Denso IK-31 (stock number 5321)

    **NOTE: Use chart for static compression and adjust heat range for nitrous use accordingly.




    4.6 Mustang GT
    Thread 14mm
    Reach - .708
    Socket 5/8 hex
    Seat - Taper
    Stock Heat Range: 5
    Gap: .054
    Plug: NGK TR55 (stock number 3951); NGK TR55IX (stock number 7164); Motorcraft AWSF-32C (copper); Autolite 764; Denso IT-16 (stock number 5325)

    Nitrous (one step colder)
    Heat Range: 6
    Gap: .035 - .038
    Plug: NGK TR6 (stock number 4177); NGK TR6IX (stock number 3689); Motorcraft AWSF-22C (copper); Autolite 103; Denso IT-20 (stock number 5326)

    Nitrous (two steps colder)
    Heat Range: 7
    Gap: Consult
    Plug: NGK BR7EF (stock number 3346); NGK TR7IX (stock number 3690); Motorcraft AWSFA-12C (copper); Autolite AR94; Denso IT-22 (stock number 5327)

    Nitrous (two and a half steps colder)
    Heat Range: 8
    Gap: Consult
    Plug: NGK R5724-8 (stock number 7317); NGK TR8IX (part number 3691); Denso IT-24 (stock number 5328)

    Nitrous (three steps colder)
    Heat Range: 9
    Gap: Consult
    Plug: NGK R5724-9 (stock number 7891); Autolite AR93; Denso IT-27

    Nitrous (four steps colder)
    Heat Range: 10
    Gap: Consult
    Plug: NGK R5724-10 (stock number 7993); Autolite AR92




    4.6 Mustang Cobra (96-01)
    Thread 14mm
    Reach - .708
    Socket 5/8 hex
    Seat - Taper
    Stock Heat Range: 5
    Gap: .054
    Plug: NGK TR55 (stock number 3951); NGK TR55IX (stock number 7164); Autolite 764; Denso IT-16 (stock number 5325)

    Nitrous (one step colder)
    Heat Range: 6
    Gap: .035 - .038
    Plug: NGK TR6 (stock number 4177); NGK TR6IX (stock number 3689); Motorcraft AWSF-22C (copper); Autolite 103; Denso IT-20 (stock number 5326)

    Nitrous (two steps colder)
    Heat Range: 7
    Gap: Consult
    Plug: NGK BR7EF (stock number 3346); NGK TR7IX (stock number 3690); Motorcraft AWSFA-12C (copper); Autolite AR94; Denso IT22 (stock number 5327)

    Nitrous (two and a half steps colder)
    Heat Range: 8
    Gap: Consult
    Plug: NGK R5724-8 (stock number 7317); NGK TR8IX (part number 3691); Denso IT-24 (stock number 5328)

    Nitrous (three steps colder)
    Heat Range: 9
    Gap: Consult
    Plug: NGK R5724-9 (stock number 7891); Autolite AR93; Denso IT-27

    Nitrous (four steps colder)
    Heat Range: 10
    Gap: Consult
    Plug: NGK R5724-10 (stock number 7993); Autolite AR92




    4.6 Mustang Cobra (03-04)
    Thread 14mm
    Reach - .708
    Socket 5/8 hex
    Seat - Taper
    Stock Heat Range: 6
    Gap: .049 - .052 (have had better results with tighter gap)
    Plug: NGK TR6 (stock number 4177); NGK TR6IX (stock number 3689); Motorcraft AWSF-22C (copper); Autolite 103; Denso IT-20 (stock number 5326)

    Nitrous (one step colder)
    Heat Range: 7
    Gap: .035 - .038
    Plug: NGK BR7EF (stock number 3346); NGK TR7IX (stock number 3690); Motorcraft AWSFA-12C (copper); Autolite AR94; Denso IT-22 (stock number 5327)

    Nitrous (two steps colder)
    Heat Range: 8
    Gap: Consult
    Plug: NGK R5724-8 (stock number 7317); NGK TR8IX (stock number 3691); Denso IT-24 (stock number 5328)
    Last edited by mrr23; 03-09-2007 at 04:52 PM.

  2. #2
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    5.0 Mustang 87-95
    Thread – 14mm
    Reach - .460”
    Socket – 5/8 hex
    Seat – Taper
    Stock Heat Range: 4
    Gap: .054
    Plug: NGK UR45 (stock number 6945); NGK UR45IX (stock number 3207)

    Nitrous (one step colder)
    Heat Range: 5
    Gap: .035 - .038
    Plug: NGK UR5 (stock number 2771); NGK UR5IX (stock number 7177)

    Nitrous (two steps colder)
    Heat Range: 6
    Gap: Consult
    Plug: NGK UR6 (stock number 7773); NGK UR6IX (stock number 7348)




    5.0 Mustang Cobra 93-95 w/ GT-40 Heads
    Thread – 14mm
    Reach - .708”
    Socket – 5/8 hex
    Seat - Taper
    Stock Heat Range: 5
    Gap: .054
    Plug: NGK TR55 (stock number 3951); NGK TR55IX (stock number 7164); Autolite 764 or 104; Denso IT-16 (stock number 5325)

    Nitrous (one step colder)
    Heat Range: 6
    Gap: .035 - .038
    Plug: NGK TR6 (stock number 4177); NGK TR6IX (stock number 3689); Motorcraft AWSF-22C (copper); Autolite 103; Denso IT-20 (stock number 5326)

    Nitrous (two steps colder)
    Heat Range: 7
    Gap: Consult
    Plug: NGK BR7EF (stock number 3346); NGK TR7IX (stock number 3690); Motorcraft AWSFA-12C (copper); Autolite AR94; Denso IT-22 (stock number 5327)

    Nitrous (three steps colder)
    Heat Range: 8
    Gap: Consult
    Plug: NGK R5724-8 (stock number 7317); NGK TR8IX (stock number 3691); Denso IT-24 (stock number 5328)




    Ford F-150 Lightning (99-04)
    Thread – 14mm
    Reach - .708”
    Socket – 5/8 hex
    Seat - Taper
    Stock Heat Range: 6
    Gap: .049 - .052
    Plug: NGK TR6 (stock number 4177); NGK TR6IX (stock number 3689); Motorcraft AWSF-22C (copper); Autolite 103; Denso IT-20 (stock number 5326)

    Nitrous (one step colder)
    Heat Range: 7
    Gap: .035 - .038
    Plug: NGK BR7EF (stock number 3346); NGK TR7IX (stock number 3690); Motorcraft AWSFA-12C (copper); Autolite AR94; Denso IT-22 (stock number 5327)

    Nitrous (two steps colder)
    Heat Range: 8
    Gap: .033 - .036
    Plug: NGK R5724-8 (stock number 7317); NGK TR8IX (stock number 3691); Denso IT-24 (stock number 5328)

    Nitrous (three steps colder)
    Heat Range: 9
    Gap: Consult
    Plug: NGK R5724-9 (stock number 7891); Autolite AR93; Denso IT-27 (stock number 5329)

  3. #3
    Member camaronx's Avatar
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    torrid red/red interior
    2005 GTO 6spd

    Great info!

    What about stock ls-2 m05 gto with cat back and 125 shot of nitrous. What plug do you reccomend? Prefferably american and not autolite they remind me of ford or maybe it's just me ot is autolite a ford plug? But a list of all that would work is fine--i had the ngk-tr6 in my 94 camaro

  4. #4
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    Red
    1995 Trans Am

    I'm new to the chevy small block game - been under the buick 3.8 v6 and lately under the Gloriful Pontiac 389 from the 60s game - but only a few months into the chevy 350 in my 95 T/A (LT1)

    Reading this post as I'm trying to see what plugs to buy to replace the ones in my TA I'm thinking - why is ACDelco a no show on the great post you got up there?? I've always been a fan of AC plugs although when pricing some at my auto parts store they tell me the TA takes platinum AC plugs -

    I've never been a fan of platinum plugs as I feel they're a tad geared towards extended life (and higher prices) and a tad less geared towards quality of performance from the plug.

    Anyone have any good stories for an AC plug in the LT1? If so lend me the part #.

    Mike

  5. #5
    Senior Member mrr23's Avatar
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    dark bowling green
    2000 corvette

    great work there. i know it took some time to make this chart. so, sticky it is.

  6. #6
    Still The Junior Member RedVertTA's Avatar
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    Red+White Top and Stripes
    2000TransAmConvertible A4

    I like how you included the info for Fords.
    FAST 90/90, SLP Lid, Kooks JetHot Coated LT's, American Racing Y-Pipe+Magnaflow Cats, DHM Electric Cutout, Flowmaster American Thunder Catback, HP Tuners Software, 343 rwhp.

    BMR Convertible Subframe Connectors, Hotchkis Strut Tower Brace, BMR Driveshaft Safety Loop.

  7. #7
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    white
    96 ws6

    I had a ? I have ngk55 plugs I'm about to put on my afr headed 383 lt1 and plan on spraying a 80shot at the track every once in awhile. So ur saying I should space them a little less than .50? I fast reply would be nice because the plugs r going in tomarrow. Thanks

  8. #8
    NYSpeed.com WhatUpWhatUp's Avatar
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    Pewter
    2002 z28 A4

    ha nice info!

  9. #9
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    red
    2009

    It is too good for those users who are not well knowledge. you can easy trace at this forum every question which is in your mind. I'll see what I can get out of it. Thank you

  10. #10
    Junior Member artie634u's Avatar
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    Indigo Blue
    2001 Trans Am WS6

    Which spark plug is better, E3 or Bosch Fusion?

  11. #11
    None Shall Pass Knight's Avatar
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    Black
    99 WS.6 - Modified

    Quote Originally Posted by artie634u View Post
    Which spark plug is better, E3 or Bosch Fusion?
    NGK tr55.

  12. #12
    Member Frozen WS6's Avatar
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    RED, BLACK
    2001 WS6, 1998 TA

    After alot of looking to find what plug to use with what shot of Nitrous this is the best tip I've found and makes things really simple.

    http://www.ngksparkplugs.com/docs/te...de_Affects.pdf


    Go One heat range for for every 75hp shot. So

    BR6 good up to 75 shot
    BR7EF good to 150 shot
    B8EFS good to 225 shot



    I've tested this first hand and it works. I was told over and over tr6 was ok for a 150 shot. My 150 shot on that plug did a best of 9.88. After finding this info I put the br7ef in (my only change) went 9.89 on a 100 shot and 9.75 on a fat 150 shot.
    Last edited by Frozen WS6; 03-12-2011 at 09:56 PM.

  13. #13
    🤔 11s. blackbirdbrain89's Avatar
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    black trans am
    2000

    in the ls1 drat heads... they take a stock style... not gasket type .. and

    list from hot to cold for autolite
    AR3910
    AR3911
    AR3932
    AR3933

    i have ran all on my gfs 77 400sbc @11.5-1CR with biug cam and 34* of timming (pump gas)

    the 3910,3911 are to cold for it, i talked to a auto lite rep told me they are for race only eng's they will not work under 3500 rpm. they are too cold

    we use the Ar 3933...in and works good


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