Ive used denso iridium and now use ngk iridium. Both have worked very well and last an eternity....as long as the car is properly tuned. A lil more expensive but you dont have to touched them as often as copper plugs.
ive been using NGK plugs in everything from my motorcycles, to cars, to outboard motors, whatever.. ive never had a problem with them.
BKR7E at .028 on a 2871R. I change them every oil change so basically ever 3k miles. For 9 bucks you can't go wrong. It's like instant power back. I have noticed though sometimes when I change them that the gap has opened up.
recently put in some NGK BKR7Es and so far so good, gapped at .026" (or .027 i can't remember and im not taking them out to check )... ran it up to 20psi and it seemed to run harder
I use BKR7E .022, I change them every 3000 miles...until now no issues..and they are cheap
brk7e's are excellent...2.5 years with no issues on this particular plug(not the same set obviously). .025 is a good gap, alot run .028..but i have found. 025 to be better,especially for frequent WOT driving in the heat here.
first set i used were NGK R5671A-7 non-resistor plugs gapped at .025\" had ran multiple sets of these for well over 20k miles with zero issues.
I have now used those plugs of mine up to 35psi so far with no issues.
I'm flashed with Revo Stage 1 and I run NGK BKR7E plugs gapped to 0.028\". They are 1 range colder and are cheap ($15 for 4 at Lordco if you have a discount). Only downside is that you should regap them every oil change, and change them ever other oil change
I just did mine not too long ago and bought the NGK's @ Advanced but they claimed that it had to be gapped @ 0.032 but when I took the old ones out, the bosch we gapped @ 0.030. I put the new ones in and you can feel it not running as smooth but I've been too lazy to find some gapped @ 0.030.
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