Ignitions and Electrical Ignition Components

NGK

Standard Spark Plug, 5/8" Hex, 19mm Reach

$6.99

SKU: NGK-R5671A-7

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Overview

It features a copper center electrode core material and a nickel center electrode tip material. The pre-gap size is .032 inches, with a 5/8" hex size and a 19mm reach.
Show original supplier description
The NGK Racing Spark Plug R5671A-7 is engineered for demanding racing applications. This plug utilizes a copper center electrode core for excellent thermal conductivity, paired with a nickel tip for durability. It comes pre-gapped to .032 inches and features a 5/8" hex size and a 19mm reach, ensuring a proper fit in many performance engines. Key specifications include a 14mm thread diameter, a gasket seat type, and a manufacturer heat range of 7. The plug is a non-resistor type with a standard ground electrode configuration and tip design. It is manufactured in Japan and has a stock number of 4091. This spark plug is noted as compatible with specific Jeep models, including the CJ5 5.0L V8 from 1972 and the CJ5 5.0L V8 from 1972-1981.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandNGK
Part NumberNGK-R5671A-7
CategoryIgnitions and Electrical

About MOTORMIA

5,000+ Trusted brands
1M+ Enthusiasts
5M+ Parts sold

Buy with Confidence

Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy

Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

View Full Shipping Policy