I am painfully familiar with the Porsche tax, but I could not believe the price of spark plugs. They are listed as $47 per plug from the “discount” Porsche Parts dealers. That’s for 1 plug best I can tell.
Searching the factory parts catalog numbers for 1970 914-6 with CDI ignition and MARELLI distributor here’s what they superseded to:
- 999-170-010-91
- 999-170-186-90
Thought maybe I could go direct to Bosch, but neither the Porsche part numbers or the product locator by model bring up any matches. I did come up with some indirect matches for a Bosch WR5DC at $5 each.
Based on other threads, and what’s available, the NGK BR6ES seems like the reasonable path at $5 from Stoddard. It’s nice to see NGK lists compatibility on their website.
P.S. The data is anecdotal, but some folks suggest avoiding platinum (i.e. “P”) plugs.
