The rotating assembly is forged (383) and I want more power. The mains have ARP studs but they are 2-bolt mains. How much N2O can it handle?

Also, I'm currently running 370 RWHP and 380 RWTQ, any concerns with the rear? Since N20 isn't used on the launch but at 3rd or 4th gear it shouldn't smack the diff too hard.

Manual T56
4.10 Final Gears
10-bolt rear with an Eaton Posi

 

I would like to know as well.

 

With out more knowledge no one is gonna be able to help you a whole lot.

What kind of pistons, Ring gap?

Generally with a forged piston you can run 150 I would say fairly safe, but without knowing the ring gap nor the type of piston its a shot in the dark. You could have really tight ring gap's and blow the motor on a small shot.

 

The pistons are forged JE Pistons with 7cc reliefs. The rings are plasma-moly and were assembled at the machine shop for N/A. The were not gapped for N2O.

I am more concerned about the bottom end on 2-bolt mains (though they have been studded). However, I see your point about the ring gaps for N/A.

 

IF the ring gaps are totally N/A as far as they can go (so to speak) I don't think id be putting hardly any nitrous at all on it.

The pistons should hold up at least, I don't see why the studded mains would not hold up either to a 150, a lot of people spray 150 on the stock short block, risky obviously. Again, ring gap is still a side issue for you, but if you want to gamble with it

 

Ring gaps could be a concern. What would be the limit for the N2O... say a 150 shot. The thermal expansion on the rings would be significant but ring-bind would be disaster. Perhaps only 5 second bursts?

 

Not only are there plenty of stock shortblocks taking 150 shots but you'll also find many taking 200. I'm not talking about you 100k mile worn out motor though. A forged rotating assembly "should" handle 200-250 wothout any problem but as you've already heard, the ring gap, if too tight, can be a deal breaker above 200. See if you can find out from the machine shop what they set it at.

 

To anser the OP question - I was on 2 bolt studded caps and the bearings looked fine after quite a bit of 600rwhp and 700tq abuse. When I pulled it apart you could see a little chatter under the caps though. So not enough to hurt but I was probably getting close to trouble.

RPM and other factors will play in also... I would not think 300 out of the question on the mains... but I would feel safe at 200.

The rear - depends on the tires. If you shift hard, drop the clutch and dump 5-6-700tq onto the rear and the tire grabs at all it will asplode.