Well my Demon picked up almost 8 tenths in the 1/8 with the 47n/53f jets for 6-7 yrs and never had ring problems but I did not spray it every pass. I was using a 5500 8 in. convertor, 4.86 & 5.13 gears probably 3400 lbs, stock interior,bench seat. I wish I had run a smaller fuel jet I might have made a 5.99 pass if it hooked.
My goal is to run a 5.99 pass in my D-50 and it is faster on motor than the Demon was on NOS.

On a 100HP shot you are not going to kill ring lands no matter what you do with 440 CID. You could block off either jet and remove no timing and maybe not run so good but you are not going to hurt it. IMO

MONTE SAYS, you should read your post guys come on. Monte has done a lot for NOS and a lot with it. You guys argue back and fourth over what Monte told you in his class. Yes, a more favorable jetting would be 47N with 40 or less Fuel. Depending on your base timing you can pull 0-6 degrees for that tuneup and expect to pick up a second.

100HP is a very forgiving level of nitrous. NOS had terrible recommendations for tune years ago. 47N/53F and remove nothing or maybe 2 degrees of timing was the recommendation. The car runs bad. So you crank the timing up. Meanwhile your rings are taking a fuel bath. The fuel trapped in your tight second ring clearance is pushing the tight top ring up and with the added timing combusting early pushing the top ring even more. The top ring butt's from lack of clearance and finally can't go anywhere and breaks the top ring land. Fuel alone can cause ring land problems. But, it usually is a combination of problems. Too much timing can murder ring lands too. I had a lean and mean tune and lost a plug wire with a small dist. cap that crossed over to the next cylinder it murdered everything. The ring lands broke, the top ring junk, the piston dome fried as well as the combustion chamber. All due to a 90 degree early firing event. I invested in a large cap and paid a lot more attention to rotor phasing and never walked away from the car with the hood off again.

Leon

this old marvin miller kit i used was out of the 70's, ended up being a 75 shot, but it still picked up .5 sec and i only sprayed 1/2 track... im hooked....figure i'll settle in at a 150 shot.