Dinan · New
Dinan B48/B58/S58 Iridium Spark Plug - Heat Range 9 - 12mm x 26.5mm x 14mm (Flat) - SINGLE
MPN D640-0001 · Store SKU dnnD640-0001
Supplier stock checked 11/8/2026, 11:12:34 AM UTC. Adding a part does not reserve it.
Request a return within 30 calendar days after delivery. New parts must be unopened and unused.
Shipping & returns ↗This policy does not limit rights required by law.Free standard shipping on eligible parts orders of $100 or more. Oversized and freight items excluded. Fitment, taxes, availability and final totals are confirmed before payment.
Product details
Dinan Iridium Spark Plugs are an excellent upgrade for tuned, and even stock engines. Our spark plugs are made from Iridium - one of the strongest materials available. They last longer than other materials with higher melting points, run cooler, resist preignition, and even require less voltage to produce a strong spark. The iridium electrode with its copper core is harder and stronger than other materials, can dissipate heat more easily, and is better protected from melting, cracking, and other limitations found with standard plugs. Dinan spark plugs are great for high boost, high cylinder pressure, high cylinder temperatures, and high-power situations, and they pair nicely with a set of Dinan ignition coils, where applicable. However, they are not only for tuned and higher output vehicles that may benefit from a plug cooler than the factory heat range – they also are applicable to non-tuned / stock vehicles as well! The D640-0001 spark plug applies to the following engines: Gen 1 B48, Gen 1 & 2 B58 engines as well as the S58. Compatible OEM Part #Cross Reference: 12120040551, 12122455258, 12120046646 & 12125A4EF60 Dinan Iridium Spark Plug - 12x26.5x14MM (Flat) - Heat Range 9 B48/B58/S58
Manufacturer fitment & guides
Check D640-0001 against the manufacturer’s application information below.
A manufacturer application guide is not available for this listing. Request the exact application from JuiceBuilt before payment.
Part-specific notes
- California Proposition 65: Y
