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    Cross Reference information is provided as a guide only. Please refer to the "Applications" lookup tabs for more detail. Materials and designs will differ among brands, so plugs are not exactly alike. Always check with your OE service manual for proper installation and settings.

    CYLINDER HEAD MANUFACTURER SPECIFICATION SHEET RECOMMENDATION DENSO IRIDIUM POWER EQUIVALENT
    AFR AIR FLOW RESEARCH

    225cc LS1 Mongoose Strip Head

    180cc SBC Street Head

    180cc LT1 Street Head

    195cc SBC Street Head

    195cc LT4 Street Head

    305/315/325/335/345/357cc Magnum BBC

    165/185cc SBF Outlaw Street Heads

    205/224cc SBF Outlaw Race Heads

    165/185cc SBF Street/Strip Outlaw Heads

    AC 41-974 Platinum

    AC 41-974 Platinum

    AC FR3LS

    AC FR3LS

    AC FR3LS

    AC FR3LS

    CH C59C, Autolite 3932

    Autolite 3924

    Autolite 3922

    Autolite 3924

    IT16

    IT16

    IK16

    IK16

    IK16

    IK16

    IK27

    IK16

    IK22

    IK16

     BRODIX

    BBC, Big Brodie series

    C.A.R.B. legal Heads

    NGK B9ES

    Ch14YC or AL3924 

    IW24 gas, IW27 alcohol

    IK16

     DART

    Big Chief, ALL

    Big M – Head

    FORD 20 Degree

    Iron Eagle, 308cc & 345 cc BBC

     

    Iron Eagle, 23 Degree, 180, 200, 215, 230cc SBC

    Iron Eagle S/S

     

    Little Chief, 11degree SBC head

    Pro 1, 23 Degree SBC & BBC all cc’s

    Race Series, 220cc SBC Head

    Race Series, 18 Degree BBC head

    .750” reach, gasket, Ch C57C/C57YC

    .750” reach, gasket, Ch C59C /C59YC Street RC12YC

    .750” reach, gasket, Ch C59C/C59YC

    .750” reach, gasket, Ch C59C /C59YC Street RC12YC

    Angle or straight, .460 reach, tapered seat, Ch V59C / V59YC

    Straight, .460” reach tapered seat Ch RV12YC / AC R44TS

    Ch C57C / C57YC

    Ch C59C / C59YC

    Ch C59C / C59YC

    Ch C57C / C57YC

    IK31, IK01-31

    IK27, Street app IK16

    IK27

    IK27, Street app IK16

    ITF27

    ITF16

     

    IK31, IK01-31

    IK27, IK01-27

    IK27, IK01-27

    IK31, IK01-31

     EDELBROCK

    All except flathead 

     FORD RACING PERFORMANCE PARTS

    GT-40 “Turbo-Swirl” Alum. Cyl. Heads

    GT-40X “Turbo-Swirl” Alum Cyl. Heads

    “Sportsman” Short Track Cast Iron Cyl. Heads

    “Z” Aluminum Head

    Robert Yates Alum. Cyl. Heads

    “High Port” Yates Head

    High Port Head for all out Performance

    Super Cobra Jet Cylinder Heads

    IK20

    IK20

    ITF20

    IQ16

    IW SERIES

    IW SERIES

    IW SERIES

    IK20

     PRO TOPLINE

    Iron Lightning, Pro Lightning

    Other

    Ch V55C, V57C

    CH C55C, C57C

    ITF24

    IK31

     TRICK FLOW

    Track Heat Alum. Cyl, heads for SB Ford

    18 Degree Alum. Heads for SB Chevy

    23 Degree Alum. Heads for SB Chevy

    R-Series cyl. Head for BB Chevy

    AC-FR3LS, Autolite- 3924, NGK 7373

    Ch C57C, AL 3932, NGK R5671A-10

    AC-FR3LS, Autolite- 324, NGK FR5, Ch -RC

    Autolite-3922

    IK16

    IK31

    IK16, IK20

    IK22

     WORLD

    Windsor Jr

    Windsor Jr. Lite

    Windsor Sr. Lite

    Roush 200 Cast Iron

    Torquer 440, Aluminum

    Sportsman II Lite

    S/R

    S/R Torquer

    Sportsman II

    MOTOWN 205/220

    MOTOWN 220 Lite

    MERLIN II OVAL & RECT. PORT

    320cc & 345cc MERLIN

    ITF20, ITF22

    IK16, IK20

    IK16, IK20

    ITF20, ITF22

    IK24, IK31

    IK16, IK20

    ITF16, ITF20

    ITF16, ITF20

    ITF16, ITF20

    ITF16, ITF20

    IK16, IK20

    ITF16, ITF20

    IK16, IK20