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NGK 6637 Spark Plug
for 1973 (please select make/model)

NGK 6637 Spark Plug - 1973 Image 1
NGK 6637 Spark Plug - 1973 Image 2
NGK 6637 Spark Plug - 1973 Image 3
NGK 6637 Spark Plug - 1973 Image 4
NGK 6637 Spark Plug - 1973

NGK
Brand:NGK
Part Number: 6637
UPC: 00087295166376
Weight: 0.06 lbs
Condition:New



On Sale:

$7.53

Availability:
17 in Stock
Warehouse: US-4
Quantity:

Product Information

Description:

Get the NGK 6637 Spark Plug for your 1973. Buy now and secure your purchase online!

NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability. NGK Iridium IX plugs offer extreme ignitability and exceptional anti-fouling. Tapered cut ground electrode provides improved starting, idling and throttle response. The Iridium fine wire center electrode's durability is six times harder than platinum. Iridium alloy's extremely high melting point is perfect for today's engines. For even greater performance consider upgrading to an NGK Ruthenium HX plug.

Features and Benefits:

  • IRIDIUM ALLOY CENTER ELECTRODE: Iridium's density (6x that of platinum) and extremely high melting point is perfect for modern high efficiency engines
  • RECOMMENDED USAGE: Modified or high performance applications, or as an upgrade to OE nickel alloy spark plugs
  • SINGLE IRIDIUM TIP: Fine wire 0.6 millimeter iridium tip center electrode ensures high durability and a consistently stable spark
  • SOLID COPPER CORE: 98% pure copper core offers superior heat dissipation, conductivity and ultra wide heat ranges
  • TAPERED CUT GROUND ELECTRODE: Reduced quenching design produces outstanding ignitability, improved acceleration, fuel efficiency and durability
  • TRIVALENT METAL PLATING: Delivers superior anti-corrosion and anti-seizing properties, ensuring ease of installation and removal

Specifications:

Center Electrode Core Material:
Copper
Center Electrode Tip Material:
Iridium
Electrical Terminal Type:
Removable Nut
Ground Configuration:
Standard
Ground Electrode Core Material:
Nickel
Ground Electrode Quantity:
1
Ground Electrode Tip Design:
Taper Cut
Hex Size:
13/16 in.
Insulator Height:
55.00 mm
Manufacturer Heat Range:
6
Part Number:
BPR6EIX
Pre-Gap Size:
.032 in.
Reach:
.75 in.
Resistance:
5000.0 Ohm
Seat Type:
Flat
Stock Number:
6637
Thread Diameter:
14.00 mm
Autolite #:
XP63
Autolite #:
XP63DP2
Autolite #:
XP64
Autolite #:
XP64DP2
Autolite #:
XS63
Autolite #:
XS63DP
Beck/Arnley #:
1765184
Bosch #:
4216
Bosch #:
4225
Bosch #:
4310
Bosch #:
4477
Bosch #:
4506
Bosch #:
4510
Bosch #:
W6DP
Bosch #:
W6DP0
Bosch #:
W7DP
Bosch #:
WGR7DDP
Bosch #:
WGR7DQI
Bosch #:
WGR8DQI
Bosch #:
WR6DP
Bosch #:
WR6DS
Bosch #:
WR7DDC4
Bosch #:
WR7DP
Bosch #:
WR7DS
Champion Spark Plug #:
247
Champion Spark Plug #:
248
Champion Spark Plug #:
N10PY
Champion Spark Plug #:
N8GY
Champion Spark Plug #:
RN10GY
Champion Spark Plug #:
RN79PYP17
Champion Spark Plug #:
RN79PYP25
Champion Spark Plug #:
RN9GY
DENSO Auto Parts #:
3045
DENSO Auto Parts #:
3065
DENSO Auto Parts #:
3116
DENSO Auto Parts #:
3291
DENSO Auto Parts #:
4709
DENSO Auto Parts #:
5306
DENSO Auto Parts #:
5502
DENSO Auto Parts #:
IW20
DENSO Auto Parts #:
IW20TT
DENSO Auto Parts #:
P20PR-S11
DENSO Auto Parts #:
VW20T
DENSO Auto Parts #:
W20EP-GU
DENSO Auto Parts #:
W20EP-ZU
DENSO Auto Parts #:
W20EPR-ZU
DENSO Auto Parts #:
W20EX-ZU
DENSO Auto Parts #:
W20EXR-ZU
Daihatsu #:
999-06910-X9-027
Mazda #:
1UN1-18-110
Mitsubishi #:
MZ602071
NGK #:
6637
Nissan #:
BY480-BPR6E
Suzuki #:
99000-79K60-P6R
Torch #:
8012
Torch #:
F6RTI
Torch #:
F6RTP
Yamaha #:
90793-20117
Yamaha #:
90793-20168
Country of Origin:
JP

Manufacturer Warranty:

2 Months

Select a vehicle to narrow NGK 6637 Spark Plug fitment info!

Last Updated: 09/02/2024

Years Vehicle Per Vehicle Fit NotesFitment Notes

1975

 

1974

 

1973

 

1972

 

1971

 

1975

 

1974

 

1973

 

1972

 

1971

 
Alfa Romeo Montreal

2.6L V8 Gas DOHC
8
 
Iridium IX Spark Plug
Gap 0.025
 

Alfa Romeo Montreal



2.6L V8 Gas DOHC Iridium IX Spark Plug
Gap 0.025

8 Per Vehicle

1978

 

1977

 

1976

 

1975

 

1974

 

1973

 

1972

 

1978

 

1977

 

1976

 

1975

 

1974

 

1973

 

1972

 
Aston Martin V-8

5.3L V8 Gas DOHC
8
 
Iridium IX Spark Plug
Gap 0.025
 

Aston Martin V-8



5.3L V8 Gas DOHC Iridium IX Spark Plug
Gap 0.025

8 Per Vehicle

1974

 

1973

 

1972

 

1974

 

1973

 

1972

 
Aston Martin Vantage

4.0L L6 Gas DOHC
6
 
Iridium IX Spark Plug
Gap 0.025
 

Aston Martin Vantage



4.0L L6 Gas DOHC Iridium IX Spark Plug
Gap 0.025

6 Per Vehicle

1975

 

1974

 

1973

 

1975

 

1974

 

1973

 
Austin Marina

1.8L L4 Gas OHV
4
 
Iridium IX Spark Plug
Gap 0.025
 

Austin Marina



1.8L L4 Gas OHV Iridium IX Spark Plug
Gap 0.025

4 Per Vehicle
BMW 2002

2.0L L4 Gas SOHC
4
 
Iridium IX Spark Plug
Gap 0.025
 

BMW 2002



2.0L L4 Gas SOHC Iridium IX Spark Plug
Gap 0.025

4 Per Vehicle

1974

 

1973

 

1974

 

1973

 
BMW 2002

2.0L L4 Gas SOHC Turbo
4
 
Iridium IX Spark Plug
Gap 0.025
 

BMW 2002



2.0L L4 Gas SOHC Turbo Iridium IX Spark Plug
Gap 0.025

4 Per Vehicle

1974

 

1973

 

1972

 

1971

 

1974

 

1973

 

1972

 

1971

 
BMW 2002tii

2.0L L4 Gas SOHC
4
 
Iridium IX Spark Plug
Gap 0.025
 

BMW 2002tii



2.0L L4 Gas SOHC Iridium IX Spark Plug
Gap 0.025

4 Per Vehicle

1973

 

1972

 

1971

 

1970

 

1969

 

1973

 

1972

 

1971

 

1970

 

1969

 
BMW R75/5

-L U/K
1
 
Iridium IX Spark Plug
Gap 0.028
 

BMW R75/5



-L U/K Iridium IX Spark Plug
Gap 0.028

1 Per Vehicle

1976

 

1975

 

1974

 

1973

 

1976

 

1975

 

1974

 

1973

 
BMW R75/6

-L U/K
1
 
Iridium IX Spark Plug
Gap 0.028
 

BMW R75/6



-L U/K Iridium IX Spark Plug
Gap 0.028

1 Per Vehicle

1976

 

1975

 

1974

 

1973

 

1976

 

1975

 

1974

 

1973

 
BMW R90/6

-L U/K
1
 
Iridium IX Spark Plug
Gap 0.028
 

BMW R90/6



-L U/K Iridium IX Spark Plug
Gap 0.028

1 Per Vehicle

1976

 

1975

 

1974

 

1973

 

1976

 

1975

 

1974

 

1973

 
BMW R90S

-L U/K
1
 
Iridium IX Spark Plug
Gap 0.028
 

BMW R90S



-L U/K Iridium IX Spark Plug
Gap 0.028

1 Per Vehicle

1973

 

1972

 

1973

 

1972

 
Citroen SM

2.7L V6 Gas DOHC
6
 
Iridium IX Spark Plug
Gap 0.032
 

Citroen SM



2.7L V6 Gas DOHC Iridium IX Spark Plug
Gap 0.032

6 Per Vehicle

1974

 

1973

 

1972

 

1971

 

1974

 

1973

 

1972

 

1971

 
Dodge Colt

1.6L L4 Gas SOHC
4
 
Iridium IX Spark Plug
Gap 0.032
 

Dodge Colt



1.6L L4 Gas SOHC Iridium IX Spark Plug
Gap 0.032

4 Per Vehicle

1974

 

1973

 

1972

 

1971

 

1974

 

1973

 

1972

 

1971

 
Fiat 124

1.6L L4 Gas DOHC
4
 
Iridium IX Spark Plug
Gap 0.025
 

Fiat 124



1.6L L4 Gas DOHC Iridium IX Spark Plug
Gap 0.025

4 Per Vehicle

1973

 

1972

 

1971

 

1970

 

1973

 

1972

 

1971

 

1970

 
Fiat 124

1.4L L4 Gas OHV
4
 
Iridium IX Spark Plug
Gap 0.025
 

Fiat 124



1.4L L4 Gas OHV Iridium IX Spark Plug
Gap 0.025

4 Per Vehicle

1979

 

1978

 

1977

 

1976

 

1975

 

1974

 

1973

 

1979

 

1978

 

1977

 

1976

 

1975

 

1974

 

1973

 
Fiat 128

1.3L L4 Gas SOHC
4
 
Iridium IX Spark Plug
Gap 0.025
 

Fiat 128



1.3L L4 Gas SOHC Iridium IX Spark Plug
Gap 0.025

4 Per Vehicle

1973

 

1972

 

1971

 

1973

 

1972

 

1971

 
Fiat 128

1.1L L4 Gas SOHC
4
 
Iridium IX Spark Plug
Gap 0.025
 

Fiat 128



1.1L L4 Gas SOHC Iridium IX Spark Plug
Gap 0.025

4 Per Vehicle

1979

 

1978

 

1977

 

1976

 

1975

 

1974

 

1973

 

1979

 

1978

 

1977

 

1976

 

1975

 

1974

 

1973

 
Honda Civic

1.2L L4 Gas SOHC
4
 
Iridium IX Spark Plug
Gap 0.032
 

Honda Civic



1.2L L4 Gas SOHC Iridium IX Spark Plug
Gap 0.032

4 Per Vehicle

1974

 

1973

 

1974

 

1973

 
Honda Civic

1.2L L4 Gas
4
 
Iridium IX Spark Plug
Gap 0.032
 

Honda Civic



1.2L L4 Gas Iridium IX Spark Plug
Gap 0.032

4 Per Vehicle

1979

 

1978

 

1977

 

1976

 

1975

 

1974

 

1973

 

1979

 

1978

 

1977

 

1976

 

1975

 

1974

 

1973

 
Jaguar XJ12

5.3L V12 Gas SOHC
12
 
Iridium IX Spark Plug
Gap 0.025
 

Jaguar XJ12



5.3L V12 Gas SOHC Iridium IX Spark Plug
Gap 0.025

12 Per Vehicle

1974

 

1973

 

1972

 

1971

 

1974

 

1973

 

1972

 

1971

 
Jaguar XKE

5.3L V12 Gas SOHC
12
 
Iridium IX Spark Plug
Gap 0.025
 

Jaguar XKE



5.3L V12 Gas SOHC Iridium IX Spark Plug
Gap 0.025

12 Per Vehicle

1976

 

1975

 

1974

 

1973

 

1972

 

1976

 

1975

 

1974

 

1973

 

1972

 
Jensen Healey

2.0L L4 Gas DOHC
4
 
Iridium IX Spark Plug
Gap 0.028
 

Jensen Healey



2.0L L4 Gas DOHC Iridium IX Spark Plug
Gap 0.028

4 Per Vehicle
Lotus Seven

1.3L L4 Gas OHV
4
 
Iridium IX Spark Plug
Gap 0.025
 

Lotus Seven



1.3L L4 Gas OHV Iridium IX Spark Plug
Gap 0.025

4 Per Vehicle

1980

 

1979

 

1978

 

1977

 

1976

 

1975

 

1974

 

1973

 

1980

 

1979

 

1978

 

1977

 

1976

 

1975

 

1974

 

1973

 
Maserati Bora

4.9L V8 Gas DOHC
8
 
Iridium IX Spark Plug
Gap 0.024
 

Maserati Bora



4.9L V8 Gas DOHC Iridium IX Spark Plug
Gap 0.024

8 Per Vehicle

1974

 

1973

 

1972

 

1971

 

1974

 

1973

 

1972

 

1971

 
Maserati Bora

4.7L V8 Gas DOHC
8
 
Iridium IX Spark Plug
Gap 0.024
 

Maserati Bora



4.7L V8 Gas DOHC Iridium IX Spark Plug
Gap 0.024

8 Per Vehicle

1973

 

1972

 

1971

 

1970

 

1969

 

1973

 

1972

 

1971

 

1970

 

1969

 
Maserati Ghibli

4.9L V8 Gas DOHC
8
 
Iridium IX Spark Plug
Gap 0.024
 

Maserati Ghibli



4.9L V8 Gas DOHC Iridium IX Spark Plug
Gap 0.024

8 Per Vehicle

1974

 

1973

 

1972

 

1974

 

1973

 

1972

 
Maserati Indy

4.7L V8 Gas DOHC
8
 
Iridium IX Spark Plug
Gap 0.024
 

Maserati Indy



4.7L V8 Gas DOHC Iridium IX Spark Plug
Gap 0.024

8 Per Vehicle
Maserati Merak

3.0L V6 Gas DOHC
6
 
Iridium IX Spark Plug
Gap 0.024
 

Maserati Merak



3.0L V6 Gas DOHC Iridium IX Spark Plug
Gap 0.024

6 Per Vehicle

1974

 

1973

 

1972

 

1974

 

1973

 

1972

 
Mazda 808

1.6L L4 Gas
4
 
Iridium IX Spark Plug
Gap 0.032
 

Mazda 808



1.6L L4 Gas Iridium IX Spark Plug
Gap 0.032

4 Per Vehicle

1976

 

1975

 

1974

 

1973

 

1972

 

1976

 

1975

 

1974

 

1973

 

1972

 
Mazda B1600

1.6L L4 Gas SOHC
4
 
Iridium IX Spark Plug
Gap 0.032
 

Mazda B1600



1.6L L4 Gas SOHC Iridium IX Spark Plug
Gap 0.032

4 Per Vehicle

1973

 

1972

 

1971

 

1970

 

1969

 

1968

 

1973

 

1972

 

1971

 

1970

 

1969

 

1968

 
Mercedes-Benz 220

2.2L L4 Gas SOHC
4
 
Iridium IX Spark Plug
Gap 0.032
 

Mercedes-Benz 220



2.2L L4 Gas SOHC Iridium IX Spark Plug
Gap 0.032

4 Per Vehicle

1974

 

1973

 

1974

 

1973

 
Mercedes-Benz 280

2.8L L6 Gas
6
 
Iridium IX Spark Plug
Gap 0.032
 

Mercedes-Benz 280



2.8L L6 Gas Iridium IX Spark Plug
Gap 0.032

6 Per Vehicle

1974

 

1973

 

1974

 

1973

 
Mercedes-Benz 280C

2.8L L6 Gas
6
 
Iridium IX Spark Plug
Gap 0.032
 

Mercedes-Benz 280C



2.8L L6 Gas Iridium IX Spark Plug
Gap 0.032

6 Per Vehicle

1973

 

1972

 

1973

 

1972

 
Mercedes-Benz 280SE

4.5L V8 Gas SOHC
8
 
Iridium IX Spark Plug
Gap 0.032
 

Mercedes-Benz 280SE



4.5L V8 Gas SOHC Iridium IX Spark Plug
Gap 0.032

8 Per Vehicle

1973

 

1972

 

1973

 

1972

 
Mercedes-Benz 280SEL

4.5L V8 Gas SOHC
8
 
Iridium IX Spark Plug
Gap 0.032
 

Mercedes-Benz 280SEL



4.5L V8 Gas SOHC Iridium IX Spark Plug
Gap 0.032

8 Per Vehicle

1973

 

1972

 

1973

 

1972

 
Mercedes-Benz 300SEL

4.5L V8 Gas SOHC
8
 
Iridium IX Spark Plug
Gap 0.032
 

Mercedes-Benz 300SEL



4.5L V8 Gas SOHC Iridium IX Spark Plug
Gap 0.032

8 Per Vehicle
MG MGB

1.8L L4 Gas OHV
4
 
Iridium IX Spark Plug
Gap 0.025
 

MG MGB



1.8L L4 Gas OHV Iridium IX Spark Plug
Gap 0.025

4 Per Vehicle

1974

 

1973

 

1972

 

1971

 

1970

 

1969

 

1968

 

1967

 

1974

 

1973

 

1972

 

1971

 

1970

 

1969

 

1968

 

1967

 
MG Midget

1.3L L4 Gas OHV
4
 
Iridium IX Spark Plug
Gap 0.025
 

MG Midget



1.3L L4 Gas OHV Iridium IX Spark Plug
Gap 0.025

4 Per Vehicle

1973

 

1972

 

1971

 

1970

 

1973

 

1972

 

1971

 

1970

 
Nissan 240Z

2.4L L6 Gas SOHC
6
 
Iridium IX Spark Plug
Gap 0.036
 

Nissan 240Z



2.4L L6 Gas SOHC Iridium IX Spark Plug
Gap 0.036

6 Per Vehicle

1979

 

1978

 

1977

 

1976

 

1975

 

1974

 

1973

 

1972

 

1971

 

1979

 

1978

 

1977

 

1976

 

1975

 

1974

 

1973

 

1972

 

1971

 
Peugeot 504

2.0L L4 Gas OHV
4
 
Iridium IX Spark Plug
Gap 0.024
 

Peugeot 504



2.0L L4 Gas OHV Iridium IX Spark Plug
Gap 0.024

4 Per Vehicle

1973

 

1972

 

1973

 

1972

 
Plymouth Cricket

1.5L L4 Gas OHV
4
 
Iridium IX Spark Plug
Gap 0.032
8th VIN Digit: G
 

Plymouth Cricket



1.5L L4 Gas OHV Iridium IX Spark Plug
Gap 0.032
8th VIN Digit: G

4 Per Vehicle

1973

 

1972

 

1973

 

1972

 
Plymouth Cricket

1.5L L4 Gas OHV
4
 
Iridium IX Spark Plug
Gap 0.035
8th VIN Digit: L
 

Plymouth Cricket



1.5L L4 Gas OHV Iridium IX Spark Plug
Gap 0.035
8th VIN Digit: L

4 Per Vehicle

1973

 

1972

 

1971

 

1973

 

1972

 

1971

 
Saab 95

1.7L V4 Gas,
1.7L V4 Gas OHV
4
 
Iridium IX Spark Plug
Gap 0.028
 

Saab 95



1.7L V4 Gas,
1.7L V4 Gas OHV Iridium IX Spark Plug
Gap 0.028

4 Per Vehicle

1973

 

1972

 

1971

 

1973

 

1972

 

1971

 
Saab 96

1.7L V4 Gas
4
 
Iridium IX Spark Plug
Gap 0.028
 

Saab 96



1.7L V4 Gas Iridium IX Spark Plug
Gap 0.028

4 Per Vehicle

1973

 

1973

 
Saab 99

2.0L L4 Gas SOHC
4
 
Iridium IX Spark Plug
Gap 0.028
Fuel Sys: FI
 

Saab 99



2.0L L4 Gas SOHC Iridium IX Spark Plug
Gap 0.028
Fuel Sys: FI

4 Per Vehicle

1974

 

1973

 

1972

 

1971

 

1970

 

1974

 

1973

 

1972

 

1971

 

1970

 
Saab Sonett

1.7L V4 Gas
4
 
Iridium IX Spark Plug
Gap 0.028
 

Saab Sonett



1.7L V4 Gas Iridium IX Spark Plug
Gap 0.028

4 Per Vehicle

1973

 

1973

 
Subaru Deluxe

1.4L H4 Gas OHV
4
 
Iridium IX Spark Plug
Gap 0.032
 

Subaru Deluxe



1.4L H4 Gas OHV Iridium IX Spark Plug
Gap 0.032

4 Per Vehicle

1975

 

1974

 

1973

 

1975

 

1974

 

1973

 
Subaru GL

1.4L H4 Gas OHV
4
 
Iridium IX Spark Plug
Gap 0.032
 

Subaru GL



1.4L H4 Gas OHV Iridium IX Spark Plug
Gap 0.032

4 Per Vehicle

1974

 

1973

 

1974

 

1973

 
Toyota Celica

2.0L L4 Gas SOHC
4
 
Iridium IX Spark Plug
w/o EGR
Gap 0.032
 

Toyota Celica



2.0L L4 Gas SOHC Iridium IX Spark Plug
w/o EGR
Gap 0.032

4 Per Vehicle

1976

 

1975

 

1974

 

1973

 

1972

 

1971

 

1970

 

1969

 

1976

 

1975

 

1974

 

1973

 

1972

 

1971

 

1970

 

1969

 
Triumph TR6

2.5L L6 Gas OHV
6
 
Iridium IX Spark Plug
Gap 0.025
 

Triumph TR6



2.5L L6 Gas OHV Iridium IX Spark Plug
Gap 0.025

6 Per Vehicle

1974

 

1973

 

1974

 

1973

 
Volkswagen 412

1.7L H4 Gas OHV
4
 
Iridium IX Spark Plug
Gap 0.024
 

Volkswagen 412



1.7L H4 Gas OHV Iridium IX Spark Plug
Gap 0.024

4 Per Vehicle

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