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E3 Spark Plugs E3 Spark Plug 14mm

368-E3.40


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E3 Spark Plugs E3.40
$6.49
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More than 10 available
E3 Spark Plug
  • Resistor: Resistor
  • Hex Size: 5/8"
  • Thread Reach: 0.460"
  • Thread Diameter: 14mm
  • Seat: Taper
  • Tip/Gap: DiamondFIRE Fixed Gap Cannot Be Adjusted
  • 1/pkg
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    Does E3 Spark Plugs E3.40 fit your vehicle?

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    1974 GMC K15/K1500 SUBURBAN

    • Liter: 5.7
    • SubModel: BASE
    • Aspiration: NATURALLY ASPIRATED
    • Fitment Notes: Resistor; 5/8 in. Hex Size; 0.460 in. Thread Reach; 14mm Thread Diameter; Taper Seat; DiamondFIRE Tip w/Fixed Gap;Plug Gap Not Adjustable
    • CUI: 350
    • Engine Type: V8 ( 5.7L / 350 )
    • Engine Vin: -

    1982 GMC K3500

    • Liter: 4.8
    • SubModel: BASE
    • Aspiration: NATURALLY ASPIRATED
    • Fitment Notes: Resistor; 5/8 in. Hex Size; 0.460 in. Thread Reach; 14mm Thread Diameter; Taper Seat; DiamondFIRE Tip w/Fixed Gap;Plug Gap Not Adjustable; For Heavy Duty Applications
    • CUI: 292
    • Engine Type: L6 ( 4.8L / 292 )
    • Engine Vin: T

    1985 GMC C3500

    • Liter: 5.7
    • SubModel: SIERRA CLASSIC
    • Aspiration: NATURALLY ASPIRATED
    • Fitment Notes: Resistor; 5/8 in. Hex Size; 0.460 in. Thread Reach; 14mm Thread Diameter; Taper Seat; DiamondFIRE Tip w/Fixed Gap;Plug Gap Not Adjustable
    • CUI: 350
    • Engine Type: V8 ( 5.7L / 350 )
    • Engine Vin: M

    1987 CHEVROLET S10

    • Liter: 2.5
    • SubModel: BASE
    • Aspiration: NATURALLY ASPIRATED
    • Fitment Notes: Resistor; 5/8 in. Hex Size; 0.460 in. Thread Reach; 14mm Thread Diameter; Taper Seat; DiamondFIRE Tip w/Fixed Gap;Plug Gap Not Adjustable
    • CUI: 151
    • Engine Type: L4 ( 2.5L / 151 )
    • Engine Vin: E

    1975 GMC C25 SUBURBAN

    • Liter: 7.4
    • SubModel: HIGH SIERRA
    • Aspiration: NATURALLY ASPIRATED
    • Fitment Notes: Resistor; 5/8 in. Hex Size; 0.460 in. Thread Reach; 14mm Thread Diameter; Taper Seat; DiamondFIRE Tip w/Fixed Gap;Plug Gap Not Adjustable; For Heavy Duty Applications
    • CUI: 454
    • Engine Type: V8 ( 7.4L / 454 )
    • Engine Vin: Z

    1983 GMC G3500

    • Liter: 5.7
    • SubModel: RALLY STX
    • Aspiration: NATURALLY ASPIRATED
    • Fitment Notes: Resistor; 5/8 in. Hex Size; 0.460 in. Thread Reach; 14mm Thread Diameter; Taper Seat; DiamondFIRE Tip w/Fixed Gap;Plug Gap Not Adjustable; For Heavy Duty Applications
    • CUI: 350
    • Engine Type: V8 ( 5.7L / 350 )
    • Engine Vin: L

    1980 CHEVROLET C10

    • Liter: 7.4
    • SubModel: CHEYENNE
    • Aspiration: NATURALLY ASPIRATED
    • Fitment Notes: Resistor; 5/8 in. Hex Size; 0.460 in. Thread Reach; 14mm Thread Diameter; Taper Seat; DiamondFIRE Tip w/Fixed Gap;Plug Gap Not Adjustable; For Heavy Duty Applications
    • CUI: 454
    • Engine Type: V8 ( 7.4L / 454 )
    • Engine Vin: S

    1981 GMC C2500

    • Liter: 5.7
    • SubModel: BASE
    • Aspiration: NATURALLY ASPIRATED
    • Fitment Notes: Resistor; 5/8 in. Hex Size; 0.460 in. Thread Reach; 14mm Thread Diameter; Taper Seat; DiamondFIRE Tip w/Fixed Gap;Plug Gap Not Adjustable; For Heavy Duty Applications
    • CUI: 350
    • Engine Type: V8 ( 5.7L / 350 )
    • Engine Vin: L

    1985 CHEVROLET K20

    • Liter: 4.3
    • SubModel: SILVERADO
    • Aspiration: NATURALLY ASPIRATED
    • Fitment Notes: Resistor; 5/8 in. Hex Size; 0.460 in. Thread Reach; 14mm Thread Diameter; Taper Seat; DiamondFIRE Tip w/Fixed Gap;Plug Gap Not Adjustable; For Heavy Duty Applications
    • CUI: 262
    • Engine Type: V6 ( 4.3L / 262 )
    • Engine Vin: N

    1973 CHEVROLET C10 PICKUP

    • Liter: 5.7
    • SubModel: BASE
    • Aspiration: NATURALLY ASPIRATED
    • Fitment Notes: Resistor; 5/8 in. Hex Size; 0.460 in. Thread Reach; 14mm Thread Diameter; Taper Seat; DiamondFIRE Tip w/Fixed Gap;Plug Gap Not Adjustable
    • CUI: 350
    • Engine Type: V8 ( 5.7L / 350 )
    • Engine Vin: W

    1988 PONTIAC 6000

    • Liter: 2.5
    • SubModel: LE
    • Aspiration: NATURALLY ASPIRATED
    • Fitment Notes: Resistor; 5/8 in. Hex Size; 0.460 in. Thread Reach; 14mm Thread Diameter; Taper Seat; DiamondFIRE Tip w/Fixed Gap;Plug Gap Not Adjustable
    • CUI: 151
    • Engine Type: L4 ( 2.5L / 151 )
    • Engine Vin: R

    1986 CHEVROLET C20

    • Liter: 5
    • SubModel: SILVERADO
    • Aspiration: NATURALLY ASPIRATED
    • Fitment Notes: Resistor; 5/8 in. Hex Size; 0.460 in. Thread Reach; 14mm Thread Diameter; Taper Seat; DiamondFIRE Tip w/Fixed Gap;Plug Gap Not Adjustable; For Heavy Duty Applications
    • CUI: 305
    • Engine Type: V8 ( 5L / 305 )
    • Engine Vin: H
    E3.40 is rated 4.3 out of 5 by 4.
    Rated 5 out of 5 by from 3rd time over of SUCCESS At one time, I ordered some of these plugs from someone beside Jeg's. They were delivered via USPS, but all losly packed. 3 of them arrived broken. Not so much with Jeg's. I love these plugs, I love their service. Life long fan and customer here for sure.
    Date published: 2018-05-05
    Rated 5 out of 5 by from Perfect! I installed this on a 1971 Mustang 351C M code 3 years ago, made an immediate and noticeable improvement. Burns through slight oil leak, fires hotter and I could feel the added Horsepower. Tried it on a 2004 Buick LaSaber V6 a few years ago did not work as well in it.
    Date published: 2018-04-07
    Rated 5 out of 5 by from Low Cost Upgrade! I have installed these plugs in many vehicles. They have always, always been an upgrade. The main improvement I've noticed is that vehicles have better throttle response off the line and through the bottom end. Some rigs also had a little improvement in gas mileage. They are indeed a low cost upgrade. I always recommend E3s to everyone.
    Date published: 2018-01-20
    Rated 2 out of 5 by from Not that good Purchesed the e3 plugs 2 monthes ago and i have allready went back to my original plug..i feel they dont burn hot enuff
    Date published: 2016-08-28
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    Do these come pre-gapped? If not how do you gap these?

    Asked by: Project_leviathansbc
    E3 plugs are pre-gapped.
    Answered by: Jegs Tech
    Date published: 2018-03-15

    I have a 1986 Monte Carlo SS with a 305, which I have installed headers. The regular E340 is to long. Do you have a shorter spark plug for this application?

    Asked by: gus86
    Not in the E3 brand of spark plugs, we do have some Accel plugs (111-8198) that are short and for your application.
    Answered by: Rusty B
    Date published: 2020-01-09

    What is the difference from E3 40 and E3 42 ? can I use them in my 1978 454 and my 1994 350 ? are they the same ?.

    Asked by: johnny 77
    The heat range are different. You would want to use the recommended plug per their catalog.
    Answered by: Flanary
    Date published: 2017-08-28
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