NGK spark plugs breaking.

Newbomb Turk said
RC14YC is the same plug as the N14. The only difference is the N plug had a 13/16 hex and the C plug has a 5/8 hex. The 5/8 hex is much nicer.

Edit: I’ve seen as many NGK and Autolites with bent ground wires, off set insulators and everything else.

I’ve used and still do use Champions in virtually everything I tune. They are easier to read.

So this bullshit that NGK’s are a step up from anything is nonsense.

I’ve pulled and replaced more NGK and Autolite plugs and made more power so many times I can’t count.

Everyone has manufacturing issues at one time or another. It is how the problems are handled. Several years ago I had problems with champions not lasting in my race car. Within a couple of weeks I would get a misfire, which I couldn't diagnose. I wound up doing back to back testing at the track. Isolated the problem to the plugs (used autolites ran fine, Champs misfired). I sent the plugs back to Champion explaining the problem. Champion just responded with "there is nothing wrong with the plugs". Didn't even bother to send them back, offer another set, nothing. I also had a problem with a boxed wrong Autolite. Just one plug out of eight. Heat range was 5 steps hotter than what the box said. Found it after I had a misfire, and pulled the plug. I sent it to Autolite, along with the box(es). They sent me a message apologizing, offered to pay for any engine damage (there was none), and sent me a case of plugs "for my inconvenience".