Racing Spark Plug
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NGK Racing Spark Plug

Part No. 4091 Warranty Details  

Fit of this part varies by vehicle & equipment specs Type of Fit

Racing plugs offer enhanced performance and durability under torturous racing conditions and provide complete combustion and enhanced cooling characteristics.

Product Features:
  • Special center electrode configuration and design help ensure durability and ignitability
  • Ground electrode configuration helps ensure durability
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Electrode Core Material:nickel with V groove
Electrode Tip Material:nickel with V groove
Ground Strap Quantity:1
Manufacturer Heat Range:7
Reach:3/4 in
Resistor:No
Seat Type:gasket
Shorty Spark Plug:No
Thread Diameter:14 mm
Tip Configuration:Solid
Type:V-Power
Wrench Diameter:5/8 in

REVIEW SNAPSHOT®

by PowerReviews
NGKRacing Spark Plug
 
4.0

(based on 4 reviews)

Ratings Distribution

  • 5 Stars

     

    (3)

  • 4 Stars

     

    (0)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (1)

75%

of respondents would recommend this to a friend.

Pros

No Pros

Cons

No Cons

Best Uses

  • Performance driving (3)
  • Racing (3)
    • Reviewer Profile:
    • Auto enthusiast (3)

Reviewed by 4 customers

Displaying reviews 1-4

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5.0

BEST RACING PLUGS MADE!!!!!

By 

from KY

About Me Auto Enthusiast, Competitive Driver, Mechanic, Truck Enthusiast

Pros

  • Durable
  • Easy To Install
  • Improves Engine Efficiency
  • Increases Power
  • Will Not Foul

Cons

  • Can't Find Any Cons

Best Uses

  • Everyday Driving
  • Performance Driving
  • Racing

Comments about NGK Racing Spark Plug:

Many of my friends and I drag race. We all use big carburetors which means our spark plugs have to burn lots of fuel. Between all of us we own over a dozen drag cars, all of which run R5671A-7 (4091) NGK spark plugs, none of which have any spark plug trouble. Since we've all starting using these NGK plugs, our plug fouling days have come to an end. We will never use any other brand, specially on any performance or racing engine.

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5.0

SPARKS NEW LIFE

By 

from ST CHARLES, MO

About Me Auto Enthusiast

Verified Buyer

Pros

  • Durable
  • Improves Engine Efficiency
  • Increases Power

Cons

    Best Uses

    • Performance Driving
    • Racing

    Comments about NGK Racing Spark Plug:

    After trying several plugs in my hot rod, I found these and have used no other sense. The are durable, seal lasts, and they do not foul as easily as other plugs. Also, as I have changed my engine, I am able to select the plug with the best heat setting. Finally, they are reasonably priced

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    (1 of 1 customers found this review helpful)

     
    1.0

    Part doesn't match online info.

    By 

    from Boston

    About Me Auto Enthusiast

    See all my reviews

    Verified Buyer
    Helpful Reviewer

    Pros

    • Wrong Part Online Wrong

    Cons

    • See It In Person At Store

    Best Uses

    • Had To Return

    Comments about NGK Racing Spark Plug:

    Part doesn't match online parts. Had to return, due to being totally wrong.

    Comment on this reviewHelp Icon

    (7 of 16 customers found this review helpful)

     
    5.0

    NGK Racing plugs

    By 

    from Lees Summit, MO

    Verified Buyer
    Helpful Reviewer

    Pros

      Cons

        Best Uses

        • Performance Driving
        • Racing

        Comments about NGK Racing Spark Plug:

        Great price [...]

        • Car & Truck:
        • Auto Enthusiast, Mechanic

        Comment on this reviewHelp Icon

        Displaying reviews 1-4

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