I have a 72 Chevelle w/a sb 383 w/forged internals and I think around 11:1 cr. The previous owner was going to run n2o so it has basically everything set up for it. I have a 2nd fuel pump, and switch in my car to set timing back and all. I'm basically wondering about the largest I can go shot wise. I was talking with a shop that has done work on the car, and they said I shouldnt go higher than around 150 - 175shot. I was thinking if the motor was built I would be able to a run larger shot than that. I dont really know much about n2o so Im just looking for some info.

 

The motor should be able to handle 200+, but there is a big learning curve to nitrous tuning. Start out at a 100 shot, work your way up as you become more familiar with spraying the car.

 

Forged internals can mean anything from a set of TRWs to JEs or Wisecos, or maybe just forged pistons and not rods, or stock crank, etc. Know which internals it has? That plays a big role aside from just having "forged internals"

 

He is correct on the true meaning of forged internals. it seems for nitrous, having forged pistons is the key for a mild nitrous set-up. cast and hyper pistons just cant withstand much detonation. Nobody wants to detonate their motor, but sometimes when you are tuning a new set-up it may happen.

 

Like stated above you need to know the specifics of the motor.

What pistons?
What Rods?
What Crank?
Does it have splayed caps?
What rings and ring gap?
Dave