Circle Track Parts & Accessories

SPARK PLUG HEAT RANGE/CROSS REFERENCE Thread Heat

Standard Non-Resistor Spark Plugs

Power/Projected Tip Non-Resistor Spark Plugs

Size/Reach

Hex

Range

Autolite

Champion

NGK

Accel

Autolite

Champion

NGK

Chevrolet, Chrysler (Wedge), Oldsmobile, Pontiac - Standard Reach - Flat Seat With Gasket

Hot

— — — — — — — —

—

—

— — NGKR5670-5

NGKB6S NGKB7S NGKB8S

— AUTAR73

— NGKR5670-6

14mm/3/8"

13/16"

AUT353

CHPJ4C

— AUTAR72 CHPJ63Y

NGKR5670-7

— —

— — NGKR5670-8 — — NGKR5670-9

Cold

—

Chevrolet (Big Block), Chrysler (Hemi) - Flat Seat With Gasket

Hot

AUTAR3935 CHPC63CX NGKR5671A-7 AUTAR3934 CHPC61CX NGKR5671A-8

—

— CHPC63YC

—

— AUTAR3911 CHPC61YC NGKR5672A-8

— AUTAR3910 †

14mm/3/4"

5/8"

AUTAR3933 † AUTAR3932 †

CHPC59CX NGKR5671A-9 CHPC57CX NGKR5671A-10

CHPC59YC NGKR5672A-9

— —

— CHPC57YC NGKR5672A-10

Cold AUTAR3931 CHPC55CX NGKR5671A-11

— —

—

Chevrolet (Big Block), Chrysler (Hemi) - Flat Seat With Gasket

Hot

— —

— — — — — —

— —

- -

— NGKBP5ES — NGKBP6ES — NGKBP7ES

AUTAR2593 AUTAR2592

— —

— AUTAR53

14mm/3/4"

13/16"

— CHPN59DR — CHPN57DR

— AUTAR52 CHPN59YDR

— — —

— AUTAR51 — AUTAR50

— —

Cold

— —

Chevrolet (Small Block), Ford (Small Block) - Conical/Tapered Seat

Hot

— —

— ACL0276S-4*

— —

—

—

-

NGKR5673-6 NGKR5673-7

—

— — NGKR5674-6

AUTAR135 CHPV63C

— AUTAR13 — AUTAR12

— NGKR5674-7 — NGKR5674-8

14mm/.460"

5/8"

AUTAR134 AUTAR133

—

—

— NGKR5673-8

— — —

— — NGKR5674-9 — CHPV59YC NGKR5674-10

AUTAR132 CHPV59C — CHPV57C

NGKR5673-9 NGKR5673-10

Cold

— CHPV57YC

—

Chevrolet (Big Block), Ford - Conical/Tapered Seat

Hot

— — — — — —

— — — — — — — — — —

— —

— CHPRS9YC

— —

— —

— AUTAR94

— NGKR5724-8

14mm/.708"

5/8"

AUTAR474 CHPS59C AUTAR473 CHPS57C

— AUTAR93 CHPS59YC NGKR5724-9 — AUTAR92 CHPS57YC NGKR5724-10

Cold

-

CHPS55C

—

-

—

—

Ford (Windsor and Big Block) - Conical/Tapered Seat

Hot

— — — — — — — —

—

— —

— —

— AUTAR33 — AUTAR32

—

18mm/.460"

13/16"

— NGKAP8FS

Cold — Important Note: Use cross reference chart as a guide only. Due to differences in design and material, plugs listed in cross reference are not exactly alike. * Signifies “shorty” style spark plug. † Special Autolite Racing “X” style electrode spark plug, which alleviates piston/spark plug clearance issues, is also available; add “X” to end of part number. — — —

Spark Plug Diagnosis

Pictures Courtesy Of Autolite

• Determine the thread diameter, length (reach), and whether tapered or gasket (flat) seat. • Select gap style. • Select heat range.

• Adjust fuel mixture and spark advance timing for maximum performance. • Inspect plugs and pistons for evidence of detonation, abnormal combustion, or excessive temperatures. • Stay with the same plug type after final heat range selection unless major modifications have been made (increasing the horsepower or operating range). Spark Plug Heat Range Tech $VSDUNSOXJ¶VKHDWUDQJHGH¿QHGDVWKHPHDVXUHRIKRZIDVWWKHWLSRIWKHSOXJGLVVLSDWHVFRPEXVWLRQKHDWFDQUDQJHIURPDVORZ DVƒ)WRDVKLJKDVƒ)0DQXIDFWXUHUVRIIHUSOXJVLQPDQ\KHDWUDQJHVIURPFROGWKURXJKPHGLXPKRWWRYHU\KRW,WLVLP - perative that the plug stay cool enough to prevent pre-ignition or electrode destruction, and still remain hot enough to burn off com- EXVWLRQGHSRVLWVWKDWIRUPDWWKH¿ULQJWLS$SOXJWKDWLVH[FHVVLYHO\FROGRUKRWIRUWKHDSSOLFDWLRQLQTXHVWLRQZLOOHYHQWXDOO\FDXVH WKHHQJLQHWRPLV¿UH:KHQZRUNLQJZLWKDQHQJLQHWKDWLVVWRFNRUPLOGO\PRGL¿HGLWLVRIWHQEHVWWRXVHWKHSOXJUHFRPPHQGHGE\ WKHFDUPDQXIDFWXUHU+RZHYHULIWKHFRPSUHVVLRQUDWLRKDVEHHQDOWHUHGDGLIIHUHQWKHDWUDQJHSOXJPD\EHUHTXLUHG0DQ\UDFHUV UHO\XSRQWKHLUHQJLQHEXLOGHUIRUSOXJKHDWUDQJHUHFRPPHQGDWLRQV,IDUDFHULVXQVXUHRIWKHFRUUHFWKHDWUDQJHWRXVHLWLVDOZD\V UHFRPPHQGHGWR³VWD\RQWKHVDIHVLGH´DQGXVHDFROGHUSOXJ$VZLWFKLQKHDWUDQJHFDQFKDQJHWKHWHPSHUDWXUHRIWKHVSDUNSOXJ WLSE\ƒ),IWKHSOXJVHOHFWHGLVWRRFROGLWZLOOHYHQWXDOO\IRXODQGPLV¿UHEXWLWZLOOQRWGDPDJHWKHHQJLQH$SOXJZKLFKLVWRR KRWFDQFDXVHSUHLJQLWLRQDQGGHWRQDWLRQRIWHQUHVXOWLQJLQDVHYHUHO\GDPDJHGHQJLQH Normal Fuel Fouled Detonation Oil Fouled

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2019-20 CIRCLE TRACK PARTS AND ACCESSORIES

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