Autolite AR51 Power Tip Spark Plug 13/16 Hex 3/4 Reach Gasket Seat Med
Universal Fit, Gasket Spark Plug Seat Style, Gasket Seat Taper, 0.75" Spark Plug Reach
Autolite Racing spark plugs feature a cut back ground electrode, anti-corrosive nickel plating, and large ground electrode for better heat transfer. Heat range Medium.
- Power Tip (Projected Tip)
- 14 mm plug
- 3/4" reach
- 13/16" hex
- Gasket seat
- Vendor Number: AR51
Note: Please use the Vendor Number to reference the PDF chart links listed.
Heat Range Chart (PDF)
Racing Plug Tech Note (PDF)
Understanding Heat Range (PDF)
Vendor Part Number AR51
- Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.
More Like This
Autolite AR3934 14mm Racing Spark Plug-5/8 Hex-Gasket-3/4 Reach-Hot
Autolite AR3911 14mm Racing Spark Plug, 5/8 Hex-Gasket Seat, 3/4 Reach
Autolite AR50 Power Tip Spark Plug 13/16 Hx 3/4 Reach Gasket
Autolite AR3933 14mm Racing Spark Plug 5/8 Hex Gasket 3/4 Reach, Hot
Autolite AR93 Power Tip Spark Plug 5/8 Hex .708 Reach Tapered Seat Med
Autolite AR132 14mm Spark Plug-5/8 Hex Taper Seat .46-Slightly Colder
Autolite AR133 14mm Racing Spark Plug-5/8 Hex, Tapered, .46 Reach, Med
Autolite AR134 14mm Spark Plug-5/8 Hex Taper Seat .46-Slightly Hotter
Autolite A353 14mm Spark Plug-13/16 Hex-Gasket Seat .375 In Reach, Med
Autolite AR3910 14mm Racing Spark Plug-5/8 Hex-Gasket-3/4 Reach-Cold
Q & A
Learn about some of the differences between factory plug wires and the improvements you'll receive with a quality set of aftermarket performance wires.
Pat talks about our red solid core spark plug wire and rajah ends.
Looking for an easy performance upgrade to your ignition system? MSD's line of Ignition Control Boxes offer extreme improvements to drivability and high rpm applications. Here's a look at the differences between the 6 series line-up.
Spark Plug Cross Reference Guide
Follow along as our expert goes through his process for replacing the steel wire covers on his 1954 Dodge 241 with a set of Offenhauser Finned Wire Covers.
Jeff demonstrates how to install the front runner drive system by Vintage Air in his 1967 Chevelle project car all while maintaining a simple, factory fresh look.
In preparation to transplant a 430hp 383 stroker into Project Chevelle, Zach R. made up a set of plug wires for the car. To keep it nice and tidy they needed to be routed just right, be the perfect length and not distract from the engine!