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Spark Plugs

The easiest way to Increase horsepower, increase fuel mileage, and lower emissions is to upgrade to high performance spark plugs from Speedway Motors. With the largest assortment of spark plugs with various tips, thread sizes, seats, reaches, and heat transfers, you will find the quality spark plug you need to achieve the performance you are looking for. Speedway Motors has spark plugs from brands like Accel, Autolite, Longacre, NGK Spark Plugs, and Champion Spark Plugs in stock and ready to ship today at the lowest prices around!

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Autolite AR3933 14mm Racing Spark Plug 5/8 Hex Gasket 3/4 Reach, Hot

Universal Fit

Seat Taper: Gasket

Spark Plug Reach: .75"

Overall Length: 14.00"

Wrench Size: 5/8"

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Champion 844 H10C SE Flathead Spark Plugs

Seat Taper: Gasket

Spark Plug Reach: 0.4375"

Thread Pitch: 14 mm

Overall Length: 2.68"

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Autolite AR133 14mm Racing Spark Plug-5/8 Hex, Tapered, .46 Reach, Med

Universal Fit

Spark Plug Reach: .46"

Overall Length: 14.00"

Wrench Size: 5/8"

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NGK Spark Plug for GM 602 Racing Crate Motors

Spark Plug Reach: .708"

Thread Pitch: 14 mm

Spark Plug Heat Range: 4

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Accel 0576S-4 Shorty Spark Plug, 5/8 Hex, .460 Reach, Tapered

Universal Fit
Video Available

Thread Pitch: 14mm

Thread Length: .250"

Overall Length: 2.627"

Wrench Size: .625"

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Autolite 216 Flathead Spark Plugs

Seat Taper: Gasket

Spark Plug Reach: 0.4375"

Thread Pitch: 14 mm

Thread Length: 0.4375"

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Autolite AR3932 14mm Racing Spark Plug-5/8 Hex-Gasket Seat 3/4 Reach

Universal Fit

Seat Taper: Gasket

Spark Plug Reach: .75"

Overall Length: 14.00"

Wrench Size: 5/8"

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Autolite AR134 14mm Spark Plug-5/8 Hex Taper Seat .46-Slightly Hotter

Universal Fit

Spark Plug Reach: .46"

Overall Length: 14.00"

Wrench Size: 5/8"

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Champion 71 RC12YC Spark Plugs for Edelbrock Flathead Ford Heads

Spark Plug Reach: .750"

Thread Pitch: 14mm

Thread Length: .75"

Overall Length: 2.96"

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Accel 0574S-4 U-Groove Shorty Spark Plug, 5/8 Hex, .460 Reach, Tapered

Universal Fit
Video Available

Spark Plug Reach: .460"

Thread Pitch: 14mm

Thread Length: .250"

Overall Length: 2.640"

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Champion 670 V59C 14mm Racing Spark Plug-.46 In Reach, 5/8 In Hex, Hot

Universal Fit

Spark Plug Reach: .46"

Thread Pitch: 14mm

Wrench Size: 5/8"

Operating Temperature: 59.00 °F

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Autolite AR3934 14mm Racing Spark Plug-5/8 Hex-Gasket-3/4 Reach-Hot

Universal Fit

Seat Taper: Gasket

Spark Plug Reach: .75"

Thread Pitch: 14mm

Wrench Size: 5/8

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Champion 668 V55C 14mm Alky Spark Plug, .46 Reach 5/8 Inch Hex, Colder

Universal Fit

Spark Plug Reach: .46"

Overall Length: 14.00"

Wrench Size: 5/8"

Operating Temperature: 55.00 °F

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Autolite AR132 14mm Spark Plug-5/8 Hex Taper Seat .46-Slightly Colder

Universal Fit

Spark Plug Reach: .46"

Overall Length: 14.00"

Wrench Size: 5/8"

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Autolite AR3910 14mm Racing Spark Plug-5/8 Hex-Gasket-3/4 Reach-Cold

Universal Fit

Seat Taper: Gasket

Spark Plug Reach: .75"

Overall Length: 14.00"

Wrench Size: 5/8"

Quick View

Accel 0276S-4 U-Groove Shorty Spark Plug, 5/8 Hex, .460 Reach, Tapered

Universal Fit

Spark Plug Reach: .460"

Overall Length: 2.650"

Wrench Size: 0.625

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Accel 0566-4 14mm U-Groove Spark Plug-5/8 Hex, .460 Reach Tapered Seat

$4.49
$4.99
On Sale
Universal Fit

Spark Plug Reach: .46"

Overall Length: 14.00"

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Champion 796 C63YC 14mm Spark Plug, .750 Reach, 5/8 Hex, 63 Heat Range

Universal Fit

Spark Plug Reach: .75"

Thread Pitch: 14mm

Wrench Size: 5/8"

Operating Temperature: 63.00 °F

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Autolite A3924 Spark Plugs for Edelbrock Flathead Ford Heads

Spark Plug Reach: .75"

Thread Pitch: 14 mm

Thread Length: .60"

Overall Length: 2.97"

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Autolite AR50 Power Tip Spark Plug 13/16 Hx 3/4 Reach Gasket Seat Cold

Universal Fit

Seat Taper: Gasket

Spark Plug Reach: .75"

Overall Length: 14.00"

Wrench Size: 13/16"

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NGK Spark Plug for GM 525/604 Racing Crate Motors

Spark Plug Reach: .708"

Thread Pitch: 14 mm

Spark Plug Heat Range: 5

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Champion 669 V57C 14mm Alky Spark Plug, .46 Reach 5/8 Inch Hex, Hotter

Universal Fit

Spark Plug Reach: .46"

Overall Length: 14.00"

Wrench Size: 5/8"

Operating Temperature: 57.00 °F

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Autolite AR135 14mm Spark Plug, 5/8 Hex, Tapered, .460 Inch Reach, Hot

Universal Fit

Spark Plug Reach: .46"

Overall Length: 14.00"

Wrench Size: 5/8"

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Autolite AR93 Power Tip Spark Plug 5/8 Hex .708 Reach Tapered Seat Med

Universal Fit

Spark Plug Heat Range: .708

Overall Length: 14.00"

Wrench Size: 5/8"

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Autolite AR51 Power Tip Spark Plug 13/16 Hex 3/4 Reach Gasket Seat Med

Universal Fit

Seat Taper: Gasket

Spark Plug Reach: .75"

Overall Length: 14.00"

Wrench Size: 13/16"

Quick View

Autolite A353 14mm Spark Plug-13/16 Hex-Gasket Seat .375 In Reach, Med

Universal Fit

Seat Taper: Gasket

Spark Plug Reach: .375"

Overall Length: 14.00"

Wrench Size: 13/16"

Quick View

Autolite AR2594 14mm Racing Spark Plug-13/16 Hex-3/4 Reach-Gasket Seat

Universal Fit

Seat Taper: Gasket

Spark Plug Reach: .75"

Overall Length: 14.00"

Wrench Size: 13/16"

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