When I install wire O-rings, I use a mini handheld belt sander to do the first 45° scarf cut. Then, I walk the ring wire around, partially depth-set in place, leaving about 5/8” of a tail. Next, I mark the mating end with a felt tip marker. This gives you a visual reference to snip, and then scarf grind in place, so it mates seamlessly and invisible. Finally, I finish driving the whole wire into depth with an appropriately sized aluminum plate, working my way around. Even though there is no visible “seam”, for asphalt race applications, I prefer to have the joint at a head bolt hole, on the inside. If it were to ever leak, I’d rather have it go inside the engine than possibly on the race surface.

Ron Flood
Cedar Machine
North Branch, MN
September, 2021