What is the main difference between o-rings and fire rings? When is one used and n ot the other?? thanks in advance

 

O-ring crushes stock firering on the HG into the head to seal

Firering replaces the stock firering on the HG.

Oring, daily driver.

Firering, competition truck.

 

You can have a fire ringed daily driver, my buddies has been fir ringed for around a year and no problems. And there are lots of other people that daily drive with fire rings. I just took a 850-ish mile trip in the last 2 days and I didn't have any problems...

 

I have fire rings on my daily driver. I've towed heavy, spray nitrous while drag racing without issue.