I’m looking for stock heat-range spark plugs for my 351W with Performer RPM heads. I used to run the 3925s (heat range 25), but I can’t seem to find them anywhere. I can still find the 3924s, but my tuner suggested sticking with a stock heat-range plug for now.
Do you know if the 3925s have been discontinued? If so, is there a replacement part number or any equivalent plugs with the same heat range and fitment?
Thanks!
Do you know if the 3925s have been discontinued? If so, is there a replacement part number or any equivalent plugs with the same heat range and fitment?
Thanks!